trig

Most popular questions
1. trig

What are the coordinates of the terminal point determined by t=7pi/6 ?

asked by BreAnne on January 27, 2012
2. trig

It is 4.7km from Lighthouse A to Port B. The bearing of the port from the lighthouse is N73E. A ship has sailed due west from the port and its bearing from the lighthouse is N31E. How far has the ship sailed from the port?

asked by Ashley on November 18, 2012
3. trig

use a half-angle identity to find the exact value of tan 105 degrees.

asked by Karen on July 22, 2013
4. trig

A pendulum is 18 feet long. Its central angle is 44º. The pendulum makes one back and forth swing every 12 seconds. Each minute, the pendulum swings _____ feet. (Answer to the nearest foot.)

asked by ahnas on June 14, 2012
5. trig

A population of wolves in a country is represented by the equation p(t)=80(0.98)^t, where t is the number of years since 1998. Predict the number of wolves in the population in the year 2008.

asked by andy on January 31, 2010
6. trig

cos/sin use 2npi and tan uses npi, but how do you know when to add 2npi or npi to the solution of the equation?

asked by Anonymous on March 19, 2014
7. Trig

A weight is oscillating on the end of a spring. The position of the weight relative to the point of equilibrium is given by y=1/12(cos8t-3sin8t), where y is the displacement (in meters) and t is the time (in seconds). Find the times when the weight is at

asked by Nicole on October 27, 2014
8. Trig

A railroad tunnel is shaped like a semiellipse as shown below. A semiellipse is shown on the coordinate plane with vertices on the x axis and one point of intersection with the positive y axis. The height of the tunnel at the center is 27 ft and the

asked by Lisa on September 27, 2014
9. trig

A survey team is trying to estimate the height of a mountain above a level plain. From one point on the plain, they observe that the angle of elevation to the top of the mountain is 24. From a point 1000 feet closer to the mountain along the plain, they

asked by Anonymous on October 10, 2012
10. Trig

prove (cscx-secx/cscx+secx)=(cotx-1/cotx+1)

asked by Bud on March 3, 2012
11. trig

A woman standing on a hill sees a flagpole that she knows is 65 ft tall. The angle of depression to the bottom of the pole is 14°, and the angle of elevation to the top of the pole is 18°. Find her distance x from the pole. (Round your answer to one

asked by Dominic on September 21, 2011
12. trig

A 2000 pound car is parked on a street that makes an angle of 12* with the horizontal (think it's a street on a hill). a) find the magnitude of the force required to keep the car from rolling down the hill. b) Find the force perpendicular to the street.

asked by ale on May 25, 2011
13. trig

What is the projection of (2,6) onto (-1,5)?

asked by BT on March 4, 2010
14. Trig

Find the point on the terminal side of θ = three pi divided by four that has a y coordinate of 1. Show your work for full credit.

asked by Mitchel on January 20, 2013
15. trig

If θ is an angle in standard position and its terminal side passes through the point (20,-21), find the exact value of sec(θ).

asked by Anonymous on December 9, 2011
16. Trig

From two different tracking stations, a weather balloon is spotted from two angles of elevation, 57degrees and 83 degrees, respectively. The tracking stations are 15 km apart. Find that altitude of the balloon. Any help given will be greatly appriciated

asked by Sonia on July 20, 2010
17. Trig

A Ferris wheel is 40 meters in diameter and boarded from a platform that is 4 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 2 minutes. How many minutes of

asked by Christine on February 13, 2013
18. Trig

The postal service places a limit of 84 inches on the combined lenght and girth (distance around) of a package to be sen parcel post. What Dimensions of a rectangular box with square cross-section will contain the largest volume that can be mailed?

asked by Meg on May 12, 2013
19. trig

an airplane has an airspeed of 430 miles per hour at a bearing of 135 degrees. the wind velocity is 35 miles per hour in the direction N30degreesE. Find the resultant speed and direction of the plane.

asked by kayleigh on April 12, 2013
20. Trig

How can I find the exact value of Sin 480 degrees? Thanks

asked by Rachal on May 12, 2011
21. Trig

Jimmy wants to rewrite the set of parametric equations x = 1/2 T + 3 and y = 2T - 1 in rectangular form by eliminating T. Which of the following equations would help him to eliminate T. A) t = 2(x-3) B) t = 2(x+3) C) t = y-1 / 2 D) t = 2(y+1)

asked by Ian on June 1, 2017
22. Trig

I need help setting these up. 1.) Use the parallelogram rule to find the magnitude of the resultant force for the two forces shown in the figure. round to one decimal place. Theta= 35 degree, b=98 lbs, c=55lb 2.) Find the magnitude and direction angle for

asked by Derrick on November 26, 2014
23. trig

a hedgehog wishes to cross a road without being run over. he observes the angle of elevation of a lamp post on the other side of the road to be 27 degrees from the edge of the road and 15 degrees from a point 10m back from the raod. How wide is the road??

asked by Fiona on October 16, 2010
24. trig

ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help AB = 23 CM

asked by jane on May 5, 2011
25. trig

prove that cos 52 + cos 68 + cos172 = 0

asked by Anonymous on October 17, 2010
26. Trig

Convert 2xy = 1 to polar form.

asked by Lost One on April 22, 2013
27. trig

Use a table of trigonometric values to find the angle θ in the right triangle in the following problem. Round to the nearest degree, if necessary. cos θ = 0.9659 A = ? H = 20

asked by ab on January 16, 2013
28. Trig

Find the exact value of tan 5pi/12 using the half-angle identity.

asked by Cynthia on October 15, 2011
29. Trig

How do you convert rectangular equations into polar equations? If x4−y4=xy , then r2=atan(b); What is a? What is b?

asked by Audrey on December 13, 2010
30. trig

A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.

asked by Ali on September 17, 2011
31. trig

half angle formula to find exact value cos 112.5 degree

asked by Billy on March 8, 2016
32. trig

A certain species of tree grows an average of 0.5 cm per week. Write an equation for the sequence that represents the weekly height of this tree in centimeters if the measurements begin when the tree is 800 centimeters tall?

asked by mia on June 28, 2012
33. trig

From the top of a tower of height 75m, a man sees two goats, both due west of him. If the angles of depression of the two goats are 10 degrees and 17 degrees, calculate the distance between them. It wants the angle of depression. I , myself, don't

asked by Anonymous on November 17, 2014
34. Trig

As you ride a ferris wheel, your distance from the ground varies sinusoidally with time. When the last passenger boards the ferris wheel and the ride starts moving, let your position be modeled by the diagram provided. Let t be the number of seconds that

asked by TRig on March 22, 2012
35. Trig

If sin a=0.31 cos a=0.95 sin b=0.47 and cos b=0.88 what is sin (a+b)? 0.78 -0.17 0.98 0.72

asked by John on April 23, 2018
36. Trig

From a point A on the ground, the angle of elevation to the top of a tall building is 24.1 degrees. From a point B, which is 600 ft closer to the building, the angle of elevation is measured to be 30.2 degrees. Find the height of the building. PLEASE HELP

asked by Jennifer on November 11, 2009
37. trig

An airplane is flying in the direction 148° with an airspeed of u = 920 kilometers per hour. Because of the wind, its groundspeed and direction are v = 820 kilometers per hour and 140°, respectively (see figure). Find the direction and speed of the wind.

asked by bob on November 2, 2015
38. trig

The point (-3, 4) is on the terminal side of angle θ in standard position. Find cot θ.

asked by tony on June 11, 2013
39. trig

simplify cos(30+x)+cos(30-x)

asked by Anonymous on December 11, 2010
40. Trig

asked by John on April 26, 2018
41. trig

How do you find the exact value of sin 5pi/8?

asked by Sierra on November 7, 2012
42. Trig

From a point P on level ground, the angle of elevation of the top of a tower is 27°10'. From a point 23.0 meters closer to the tower and on the same line with P and the base of the tower, the angle of elevation of the top is 51°30'. Approximate the

asked by Bob on June 26, 2012
43. Trig

The angle 2x lies in the fourth quadrant such that cos2x=8/17. 1.Which quadrant contains angle x? 2. Determine an exact value for cosx 3. What is the measure of x in radians? ---------------- I know that quadrant 4 has 2x in it, so quadrant _____ has to

asked by Halle on May 31, 2009
44. Trig

An airplane is flying on a compass heading (bearing) of 340 degrees at 325 mph. A wind is blowing with the bearing 320 degrees at 40 mph. Find the component form of the velocity of the airplane. then find the actual ground speed and direction of the plane

asked by K on December 17, 2010
45. Trig

A tourist looks from the observation deck of the space needle in Seattle. The deck is at a height of 520ft. She sees her friend on the ground below at an angle of depression of 83.1 degrees. What is the distance between the two? Round to the nearest tenth

asked by Kay on February 28, 2018
46. Trig

Write a quadratic equation whose roots are 5 + i radical 2 and 5 – i radical 2 ____ x^2 + _____ x+ ______=0

asked by Kiki on April 26, 2014
47. trig

From the foot of a building i have to look upwards at an angle of 22 degrees to sight the top of a tree. From the top of a building, 150 meters above ground level, I have to look down at an angle of depression of 50 degrees to look at the top of the tree.

asked by Jiskha on February 27, 2014
48. trig

Find all angles θ between 0° and 180° satisfying the given equation. (Enter your answers as a comma-separated list. Round your answers to one decimal place.) cos θ = 1/7

asked by stellar on September 30, 2011
49. trig

sketch one cycle of y=-3 sin 0 i know you guys wouldnt be able to draw it for me on here, but is this able to do on a graphing calculator, or could u explain the steps needed to do this problem? thanks in advance

asked by jerson on May 19, 2008
50. trig

A plane has an airspeed of 200 miles per hour and a heading of 28.0°. The ground speed of the plane is 207 miles per hour, and its true course is in the direction of 38.0°. Find the speed and direction of the air currents, assuming they are constants.

asked by bryan on November 29, 2012
51. trig

Angle θ lies in the second quadrant, and sin θ = 3/5. Find cos θ and tan θ.

asked by Britt on April 1, 2016
52. Trig

A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.

asked by Emily on April 1, 2012
53. trig

determine the solutions for tanxcos^2x-tanx=0 in the interval XE[-2pi,2pi] Ok, please describe the steps to me that you used to solve this! thank you

asked by Anonymous on April 27, 2009
54. trig

A computerized spin balance machine rotates a 35-inch-diameter tire at 400 revolutions per minute. (a) Find the road speed (in miles per hour) at which the tire is being balanced. (Round your answer to two decimal places.) (b) At what rate should the spin

asked by Jesse on January 23, 2014
55. TRIG

A circular power saw has an 8-1/2 inch diameter blade that rotates at 4400 revolutions per minute. a)Find the angular speed of the saw blade in radians per minute. b)Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact

asked by Daisy on September 23, 2012
56. Trig

Find the length of a chord intercepted by a central angle of 25 degrees in a circle of radius 30 feet

asked by Anonymous on April 6, 2016
57. Trig

a smokestack is 190 feet high. a guy wire must be fastened to the stack 30.0 feet from the top. the guy wire makes an angle of 39.0deg with the ground. find the length of the guy wire

asked by Struggler in math on October 21, 2015
58. trig

A plane ascends at a 40° angle. When it reaches an altitude of one hundred feet, how much ground distance has it covered? To solve, use the trigonometric chart. Round the answer to the nearest tenth.

asked by Anonymous on February 3, 2010
59. trig

1. A Ferris wheel with a radius of 7m makes one complete revolution every 16 s. The bottom of the wheel is 1.5m above ground. a)Find the equation of the graph b)predict how the graph and the equation will change if the Ferris wheel turns more slowly c)

asked by Azal on July 20, 2013
60. trig

Solve for sin4x=sin2x?

asked by Anonymous on March 7, 2016
61. trig

Rewrite cos4x as an equivalent expression that does not contain powers of trigonometric functions greater than 1.

asked by Steve on December 16, 2009
62. trig

53. A 60-foot drawbridge is 24 feet above water level when closed. When opened the bridge makes an angle of 33 degrees with the horizontal. a. How high is the tip P of the open bridge above the water? b. When the bridge is open, what is distance from P to

asked by Anonymous on February 17, 2012
63. Trig

Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)

asked by Lauren on October 22, 2009
64. Trig

a sailor out in a lake sees two likght houses 11km apart along the shore and gets bearings of 285degrees from his present position for light house A and 237degrees for light house B. From light house B, light house A has a bearing of 45degrees. How far to

asked by Sonia on July 21, 2010
65. trig

A boat is 23 mi due west of lighthouse A. Lighthouse B is 14 mi due north of lighthousenA. Find the bearing of lighthouse B from the boat and the distance from lighthousenB tho the boat.

asked by Pcwest on September 24, 2012
66. trig

A tree on a hillside casts a shadow c ft down the hill. If the angle of inclination of the hillside is b to the horizontal and the angle of elevation of the sun is a, find the height of the tree. Assume a = 48°, b = 18° c = 235 ft. (Round your answer to

asked by Anonymous on November 29, 2012
67. Trig

Evaluate the trigonometric function using its period as an aid. cos 5pi how would i go about finding the period and what is a period?

asked by Anonymous on September 30, 2007
68. trig

Find value of tan75/2

asked by Ram on October 21, 2011
69. Trig

Find the approximate value of cot θ​, given that csc θequals=3.5891420 and θ is in quadrant I.

asked by Ashley on January 26, 2017
70. Trig

A 12 foot ladder leans against a building. The top of the ladder leans against the wall 10.5 feet from the ground. What is the angle formed by the ground and the ladder? Assume its a right triangle.

asked by Charlie on April 17, 2013
71. trig

find exact value of cos(23pi/6)

asked by shaili on August 9, 2010
72. Trig

How do I solve the following? sec 3 theta/2 = 2 on the interval 0

asked by Katie on March 14, 2010
73. Trig

Two tracking stations are on the equator 161 miles apart. A weather balloon is located on a bearing of N 32°E from the western station and on a bearing of N 16°E from the eastern station. How far is the balloon from the western station? Round to the

asked by Nicole on November 19, 2014
74. trig

a 725 pound trailer is sitting on a ramp inclined at 36 degrees. how much force is required to keep the trailer from rolling down the ramp??

asked by Anonymous on April 16, 2014
75. trig

An airplane is traveling at a speed of 724 km per hour at a bearing of N30°E. If the wind velocity is 32 km per hour from the west, find the resultant speed and direction of the plane.

asked by Lin on February 23, 2015
76. trig

what is terminal point of 5pi/4?

asked by KLL on July 28, 2015
77. trig

two ships p and q left a port at the same time. q sailed on a bearing of 150 while p sailed on the north side of q. after a distance of 8km and 10km by pand q respectively, their distance apart was 12km. find the bearing of p and r

asked by isaac on February 4, 2015
78. trig

A plane is flying with an airspeed of 150 miles per hour and heading 155°. The wind currents are running at 25 miles per hour at 160° clockwise from due north. Use vectors to find the true course and ground speed of the plane.

asked by janice on November 16, 2012
79. trig

The captain of a ship at sea sights a lighthouse which is 120 feet tall. The captain measures the the angle of elevation to the top of the lighthouse to be 19 ^\circ. How far is the ship from the base of the lighthouse?

asked by Dan on October 1, 2011
80. trig

what is the reference angle for 17 pi/12?

asked by Brandon on August 23, 2011
81. trig

A bird at the top of a tree looks down at a field mouse with an angle of depression of 65 degrees. If the field mouse is 30 meters from the base of the tree, find the distance from which the field mouse to the bird's eyes. Round the answer to the nearest

asked by Jackie on July 22, 2013
82. trig

How do I find the exact value of sin (pi/24)?

asked by Luis on March 17, 2013
83. Trig

Charo is 50 feet from the tallest totem pole, located in Alberta Bay, Canada, which has a height of 173 feet. If Charo’s eyes are 5 feet from the ground, find the angle to the nearest degree of elevation for her line of sight to the top of the totem.

asked by Anonymous on May 29, 2014
84. trig

solve equation for the exact solutions if possible put answer in degrees. 2tanx/3-tan^2x=1

asked by jeff on May 30, 2012
85. trig

A city averages 14 hours of daylight in June, 10 in December, 12 in both March and September. Assume that the number of hours of daylight varies sinusoidally over a period of one year. Write an expression for n, the number of hours of daylight, as a cosine

asked by Kelslie on May 4, 2009
86. trig

An airplane has an airspeed of 450 km/hr bearing N45E. The wind velocity is 30 km/hr in the direction N30W. What is the ground speed and what is its direction?. I have gotten this far: A= 450cos(45), 450sin(45) = (318.20, 318.20) W= 30cos(120), 30sin(120)

asked by VEJ on July 13, 2011
87. trig

verify the identity: sin(x+y)-sin(x-y)=2cosx siny

asked by stacey graham on March 26, 2010
88. Trig

A ship is headed directly toward a coastline formed by a vertical cliff (segment BC) that is 80 meters high. At point A, from the ship, the measure of the angle of elevation to the top of the cliff (B) is 10°. A few minutes later, at point D, the measure

asked by Amanda on April 12, 2010
89. trig

The number of revolutions made by a figure skater for each type of axel jump is given. Determine the measure of the angle generated as the skater performs each jump. Give the answer in both degrees and radians. a. single axel: 1.5 b. double axel: 2.5 c.

asked by meg on September 6, 2008
90. trig

If (m+2)sin ø + (2m-1)cos ø = 2m+1 then tan ø is equal to

asked by amit on May 29, 2013
91. trig

If A+B+C=^(^=180) prove that sinA + sinB - sinC = 4sinA/2 sinB/2 cosC/2

asked by ody on May 28, 2008
92. trig

a carousel has eight evely spaced seats shaped like animals. During each ride, the carousel makes between 8 and 9 clockwise revolutions. At the end of one ride, the carousel stops so that the lion is in the position where the zebra was when the ride

asked by TJ on May 7, 2014
93. trig

A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 4 mi apart, to be x = 27° and y = 53°, as shown in the figure. (Round your answers to two decimal places.) (a) Find the distance of the plane from point

asked by stellar on September 30, 2011
94. Trig

Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above

asked by Carl on December 13, 2011
95. trig

Which expression is equivalent to cos(4x) + cos(2x)?

asked by Anonymous on March 1, 2012
96. trig

Juana and Diego Gonzales, ages six and four respectively, own a strong and stubborn puppy named Corporal. It is so hard to take Corporal for a walk that they devise a scheme to use two leashes. If Juana pulls with a force of 23 lbs at an angle of 18° and

asked by J on December 12, 2013
97. trig

wha tis the exact value of sin 9pi/4

asked by kia on October 14, 2010
98. trig

Verify the identity sin 3x cos 3x = 1/2 sin 6x can you show step by step please

asked by Ali on April 19, 2010
99. Trig

Two ships leave the same port at 7.am. The first ship sails towards europe on a 54 degree course at a constant rate of 36 mi/h. The second ship,neither a tropical destination, sails on a 144 degree course at a constant speed of 42 mi/h. Find the distance

asked by Pcwest on September 24, 2012
100. trig

whats 21° 44' 3" as a decimal to the nearest thousandth of a degree

asked by trey on November 7, 2011