Tuesday

July 29, 2014

July 29, 2014

**Recent Homework Questions About Trigonometry**

Post a New Question | Current Questions

**trig**

A and B are positive acute angles. if sin A=4/5 and cos B=8/17 find the value of tan (A-B) is the answer =43/100
*Thursday, April 10, 2014 at 5:26pm*

**trig**

An airplane has air speed of 540 mph and a heading of 50*. The wind is blowing from the north at 27 mph. Find the plane's ground speed and course direction.
*Thursday, April 10, 2014 at 3:57pm*

**trig**

Use standard identities to express sin(2θ+π/3) in terms of sinθ and cosθ
*Thursday, April 10, 2014 at 8:20am*

**trig**

a plane is 50000 ft in the air and 30000 ft from an airport find the angle of depression from the plane to the airport
*Wednesday, April 9, 2014 at 7:02pm*

**algebra 2/trig**

Tina can paint a room in 8 hours, but when she and her friend Emily work together, they can complete the job in 3 hours. How long would it take Emily to paint the room alone?
*Wednesday, April 9, 2014 at 10:34am*

**trig**

cscx+1/cscx cosx = secx+tanx
*Tuesday, April 8, 2014 at 5:06pm*

**maths Pls help trig**

1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0<B<90 , prove that 4cos2B+3sin2B=4 4.Prove ...
*Tuesday, April 8, 2014 at 11:01am*

**MathS triG**

1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA-2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[-360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0<B<90 , prove that 4cos2B+3sin2B=4 4.Prove ...
*Tuesday, April 8, 2014 at 10:51am*

**Math - Int Trig**

Given the functions: f(x)=2x+2 g(x)=3/x^2+2 h(x)=sqrt(x-2) Find the following 1) (f∘g)(-5) 2) (h∘g)(3) 3) (g∘h)(-2) 4) (g∘g)(-2) 5) (f∘h)(12) Find the following and state the domain: 6) h∘g 7) f∘g 8) g∘f 9) g∘g 10)g∘h
*Thursday, April 3, 2014 at 7:43pm*

**trig**

Help! Ships A and B leave port at the same time and sail on straight paths making an angle of 60 degrees with each other. HOw far apart are the ships at the end of 1 hour if the speed of ship A is 25 km/h and that of ship B is 15 km/h?
*Wednesday, April 2, 2014 at 6:18pm*

**trig**

a hot air balloon climbs continuously along a 30° angle to a height of 5,000 feet. To the nearest tenth of a foot, how far has the balloon traveled to reach 5,000 feet? Draw a sketch and then solve.
*Tuesday, April 1, 2014 at 5:51pm*

**trig**

The ferris wheel in an amusement park. It has a diameter of 24m, and it takes 40s to make one complete revolution. If Peter gets on a gondola which is vertically below the centre of the ferris wheel, find his rise in the height after 5s.
*Monday, March 31, 2014 at 8:54am*

**Trig**

If 0 ≤ x ≤ 2π, which equation is a line of symmetry for the graph of y = cos x? x = 0 x = 2π x = π y = 0
*Sunday, March 30, 2014 at 1:04am*

**Trig**

On the same set of axes, sketch and label the graphs of the equations y = cos 2x and y = –2 sin x in the interval 0 ≤ x ≤ 2π. How many values of x in the interval 0 ≤ x ≤ 2π satisfy the equation –2 sin x – cos 2x = 3? A.1 B.2 C....
*Sunday, March 30, 2014 at 1:03am*

**Trig**

In ΔABC, a = 19, c = 10, and m∠A = 111. Which statement can be used to find the value of C?
*Saturday, March 29, 2014 at 9:52pm*

**Trig**

What is the total number of solutions for the equation 3 tan^2 A + tan A – 2 = 0 in the interval. 0 ≤ A ≤ π?
*Saturday, March 29, 2014 at 9:51pm*

**Trig**

If the period of a cosine function is 1/3 what is the frequency of the function?
*Saturday, March 29, 2014 at 9:50pm*

**trig**

A plane is flying due south at a speed of 192 mph. a wind is blowing in at 53 degrees at 13 mph. what is the bearing of the plane?
*Thursday, March 27, 2014 at 10:09am*

**Trig Identities**

Explain why Sin of theta= -The square root of 1-cos^2 theta is not an identity, using either graphical or numerical reasoning.
*Tuesday, March 25, 2014 at 6:40pm*

**trig**

tan^2(5x)cos^4(5x) = 1/8 - 1/8cos(20x)
*Monday, March 24, 2014 at 8:32pm*

**trig**

tan^2(5x)cos^4(tx = 1/8 - 1/8cos(20x)
*Monday, March 24, 2014 at 8:32pm*

**trig**

Find csc(theta), tan (theta), and cos (theta), where theta is the angle shown in the figure. Give exact values, not decimal approximations c=10 b=7 a=7.14 the right angle is locate between sides a and b and the theta angle is an acutle angle sides b and c. i have sin theta as ...
*Monday, March 24, 2014 at 1:29pm*

**Trig - sum and difference formulas**

Write the expression as a single trigonometric functions: cos 6x cosx - sin6x sin x if you could do it step by step? also... How do I prove that sin(90deg + theta) = cos(theta)?? also step by step so i may learn?
*Monday, March 24, 2014 at 12:21am*

**Trig**

The number of values in the interval –π ≤ x ≤ π that satisfy the equation sin x = 2 cos x is 1 2 3 4 0
*Sunday, March 23, 2014 at 6:46pm*

**trig**

Suppose that Magnus' blood pressure can be modeled by the following function {{{p(t)=83-18sin(71pi*t)}}} Magnus' blood pressure increases each time his heart beats, and it decreases as his heart rests in between beats. In this equation, p(t)is the blood pressure in ...
*Sunday, March 23, 2014 at 7:05am*

**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?
*Wednesday, March 19, 2014 at 9:32pm*

**math trig**

a triangle has a measured of hypoteneuos 15 and an adjacent of 10 solve for the triangle.
*Wednesday, March 19, 2014 at 7:03pm*

**math trig**

verify the identities COSX OVER 1PLUS SINX PLUS 1PLUS SINX OVER COSX IS EQUAL TO 2SEC.
*Wednesday, March 19, 2014 at 7:00pm*

**math trig**

a triangle abc has a mearsure of an adjacent 15 and 25 degree solve for the triangle
*Wednesday, March 19, 2014 at 6:54pm*

**trig**

Find all angles, 0≤A<360, that satisfy the equation below, to the nearest 10th of a degree. 2tanA+6=tanA+3
*Sunday, March 16, 2014 at 9:16pm*

**Math ( trig )**

If a person on the Ferris wheel is 45 feet above the ground. The Gris wheel has a radius of 47.f and is 5 feet above the ground. At what degrees had the Ferris wheel rotated counted clockwise?
*Wednesday, March 12, 2014 at 3:59pm*

**trig**

a kite is flying at an angle of elevation of about 40 degrees. all 80 meters of string have been let out. ignoring the sag in the string, find the height of the kite to the nearest 10 meter
*Sunday, March 9, 2014 at 11:15pm*

**math trig**

A TOWER AND A MONUMENT STAND ON A LEVEL PLANE.THE ANGLES OF DEPRESSION OF THE TOP AND BOTTOM OF THE MONUMENT VIEWED FROM THE TOP OF THE TOWER ARE 13DEGREE AND 31 DEGREE,RESPECTIVELY;THE HEIGHT OF THE TOWER IS 145 FT. FIND THE HEIGHT OF THE MONUMENT.
*Sunday, March 9, 2014 at 7:43pm*

**math trig**

two points A and Bare 80 feetapart on the same side of A towerand on a horizontal line through its foot.if angle of elevation of the top of the tower at A is 21 degree and B is 46 degree find the height of the tower.
*Sunday, March 9, 2014 at 7:40pm*

**trig**

three forces
*Sunday, March 9, 2014 at 4:46pm*

**Trig**

A guy wire attached to the top of an electric pole makes a 70deg angle with the level ground. At a point 25 feet from the guy wire (farther away from the pole), the angel of elevation to the top of the pole is 42deg. How long is the guy wire?
*Friday, March 7, 2014 at 4:34am*

**Trig**

Given ∆ABC. If side a is twice as long as side b, is <A necessarily twice as large as <B? Why?
*Thursday, March 6, 2014 at 10:27pm*

**Trig**

A guy wire attached to the top of an electric pole makes a 700 angle with the level ground. At a point 25 feet from the guy wire (farther away from the pole), the angel of elevation to the top of the pole is 420. How long is the guy wire?
*Thursday, March 6, 2014 at 10:26pm*

**trig**

city a is 300 miles directly north of city b assuming the earth to be a sphere of radius 4000 miles determine the difference in latitude of the two cities make answers accurate to the nearest second
*Wednesday, March 5, 2014 at 8:21pm*

**Trig**

A weather balloon is sighted between points A and B which are 5 miles apart on level ground. The angle of elevation of the balloon from A is 37 degrees and it's angle of elevation from B is 58 degrees. Find the height, in feet, of the balloon above the ground.
*Wednesday, March 5, 2014 at 12:52pm*

**Trig**

How do you solve this problem? y = 2sin 3x + 4sin 2x I haven't done these types of problems for awhile and have forgotten how to do them.
*Wednesday, March 5, 2014 at 7:52am*

**Geometry/Trig**

A plane is flying and show an air speed of 130 mi/h. However, there is a 20 mi/hr crosswind. What is the resulting speed of the plane.
*Monday, March 3, 2014 at 12:24am*

**Trig**

given that sinx=3/4 and cosy=-5/13 and both x and y are in quadrant II, find the exact value of cos(x-y)
*Sunday, March 2, 2014 at 5:54pm*

**Trig**

Prove the following: 1/(tanØ - secØ ) + 1/(tanØ + secØ) = -2tanØ (1 - sinØ)/(1 + sinØ) = sec^2Ø - 2secØtanØ + tan^2Ø
*Friday, February 28, 2014 at 9:41pm*

**Trig**

Verify the given equations: ____1______ + ____1_______ = -2 tanθ tanθ – secθ tanθ + secθ 1 – sinθ = sec2θ – 2 secθ tan θ + tan2θ 1 + sinθ
*Friday, February 28, 2014 at 8:53pm*

**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. A) How tall is the ...
*Thursday, February 27, 2014 at 1:52pm*

**Alg/Trig**

The angle of elevation from a point on the ground to the top of a tree is 39.8 degrees. The angle of elevation from a point 51.7 ft farther back to the top of the tree is 19.7 degrees. Help find the height of the tree.
*Wednesday, February 26, 2014 at 11:17am*

**trig**

a sailor on a boat 580 metres from the base of a vertical cliff sights the top of a lighthouse with an angel of elevation of 31 degrees
*Wednesday, February 26, 2014 at 8:17am*

**trig**

an=(-1)n+1/2n
*Tuesday, February 25, 2014 at 11:21pm*

**trig**

Use a calculator to find: θ if θ = csc-1 1.7516. θ = _____°. Round to three decimal places.
*Sunday, February 23, 2014 at 5:42pm*

**math12A TRIG pleas help**

a farmer wishes to fence a field in the form of a right triangle.If one angle of the right triangle is 43.2 degree and the hypotenuse is 200yard,find the amount of fencing needed.
*Thursday, February 20, 2014 at 2:10am*

**Trig**

A plane is 48 miles west and 49 miles north of an airport. The pilot wants to fly directly to the airport. What bearing should the pilot take? In degrees and minutes
*Wednesday, February 19, 2014 at 12:09pm*

**Trig**

A straight road slopes upward 14 degrees from the horizontal. A vertical telephone pole beside the road casts a shadow of 60 feet down the road. if the angle of elevation of the sun is 55 degrees, what is the height of the telephone pole?
*Monday, February 17, 2014 at 4:30am*

**Trig**

If f(x)=cos^2x and g(x)=sin^2x, what is (f+g)(pi/15)
*Saturday, February 15, 2014 at 7:29pm*

**trig**

If $5000 is invested at a rate of 3% interest compounded quarterly, what is the value of the investment in 5 years?
*Wednesday, February 12, 2014 at 8:10pm*

**trig**

Given csc theta= 4, cot theta < 0 Find the exact values of cos theta and tan theta
*Tuesday, February 11, 2014 at 9:35pm*

**math - trig**

Why cant we solve an oblique triangle with the Law of Sines if we are given SAS?
*Monday, February 10, 2014 at 8:34pm*

**trig**

City A is 300kilometer due east of city B. city C is 200kilometer on a bearing of 123degree from city B.how far is it from C to A
*Monday, February 10, 2014 at 1:59pm*

**trig**

a central angle intercepts an arc on a circle equal in length to the diameter of the circle. find the measure, in radians, of the central angle.
*Thursday, February 6, 2014 at 3:18pm*

**Math - Trig**

Explain why we cannot solve an oblique triangle with the Law of Sines given SAS.
*Thursday, February 6, 2014 at 3:37am*

**Math - Trig**

Use the law of cosines to show that the measure of each angle of an equilateral triangle is 60deg. Explain your reasoning.
*Thursday, February 6, 2014 at 2:54am*

**Math - Trig**

What familiar formula can you obtain when you use the third form of the Law of Cosines c^2 = a^2 + b^2 - 2ab cos C and you let C = 90deg? What is the relationship between the Law of Cosines and this formula?
*Thursday, February 6, 2014 at 2:54am*

**trig**

An advertising blimps hovers over stadium at the altitude of 152 m.the pilot sites a tennis court at in 80 degree angle of depression. Find the ground distance in the straight line between the stadium and the tennis court. (note: in an exercise like this one, and answers ...
*Thursday, February 6, 2014 at 12:04am*

**trig**

An advertising blimps hovers over stadium at the altitude of 152 m.the pilot sites a tennis court at in 80 degree angle of depression. Find the ground distance in the straight line between the stadium and the tennis court. (note: in an exercise like this one, and answers ...
*Thursday, February 6, 2014 at 12:00am*

**trig**

A kite is flying at an angle of elevation of about 40 degrees. All 80 meters of string have been let out. Ignoring the sag in the string, find the height of the kite nearest ten meters.
*Wednesday, February 5, 2014 at 11:51pm*

**trig**

A kite is flying at an angle of elevation of about 40 degrees. All 80 meters of string have been let out. Ignoring the sag in the string, find the height of the kite nearest ten meters.
*Wednesday, February 5, 2014 at 11:49pm*

**trig**

Find all the solutions from [0, 2pi] cot^2x+csc=x
*Tuesday, February 4, 2014 at 7:08pm*

**Trig**

A fan makes 3 revolutions per second. The blades are 21 inches long. How do I find the angular velocity of a fan blade? in radians per second
*Monday, February 3, 2014 at 4:24am*

**trig**

Your search for A surveyor is trying to determine the width of a river. He forst stands at point A, directly opposite a tree at point B. He then walks 100 feet to point C. He measures the acute angle at point C to be 79 degrees. What is the width of the river?
*Sunday, February 2, 2014 at 8:56pm*

**Trig**

the sine of an angle is 0.6. the constraint is the angle lies in quadrant II. how do I figure out what x is to solve the six functions?
*Saturday, February 1, 2014 at 10:28pm*

**trig**

if sin and sec of theta are less than zero what quadrant is it in
*Wednesday, January 29, 2014 at 7:11pm*

**trig**

sin 60 ka man
*Tuesday, January 28, 2014 at 11:50pm*

**trig**

A person stands at a distance from the tower and eyes the top of the tower at 30 degree angle of elevation. He then walks 425 feet towards the tower and eyes the top of the tower at a 58 degree angle of elevation. The person is 5 feet tall. How tall is the tower?
*Sunday, January 26, 2014 at 3:37am*

**trig**

csc^4-cot^4= 1+cos^2/sin^2 i need help! please help me
*Friday, January 24, 2014 at 8:46pm*

**Trig**

Use a graphical method to find a solution to the following system of equations in the interval –1 ≤ x ≤ 5: y = x2 – 4x + 2 y = x + 2 The solution set to this system of equations in the interval –1 ≤ x ≤ 5 is {} {(2, 0)} {(0, 2), (5, 7...
*Friday, January 24, 2014 at 4:08pm*

**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 balance machine be ...
*Thursday, January 23, 2014 at 5:58pm*

**Algebra 2/ Trig**

Igor is flying a kite. he has let out 300 feet of kite string. the string makes an angle of 64 degrees with the level ground. To the nearest foot, how high is his kite?
*Tuesday, January 21, 2014 at 5:53pm*

**trig**

simplify (1-cot^2x sec^2x) / ( cot^2x)
*Thursday, January 16, 2014 at 11:54pm*

**trig**

simplify (1-cot^2x sec^2x) / ( cot^2x)
*Thursday, January 16, 2014 at 11:53pm*

**Trig**

Solve triangle ABC given the following conditions: 1. C = 135.77 deg, b = 10cm, a = 12cm 2. a = 11.5m, b = 10m, c = 16.94m
*Wednesday, January 15, 2014 at 1:01am*

**TRIG help quickly please**

Mark any solutions to the equation 2cos2x - 1 = 0. The answer can be more than one. Thank you π/8 -7π/4 15π/4 3π/4
*Tuesday, January 14, 2014 at 10:55pm*

**TRIG,**

Can you solve and show me the work in these two equations? cos(3x)=-1 tan (theta)=-1
*Sunday, January 12, 2014 at 10:59pm*

**trig**

write a formula f*g*h when f(x)=x+1, g(x)=3x, h(x)=4-x
*Sunday, January 12, 2014 at 8:07pm*

**trig**

A pilot is flying at 10,000 feet and wants to take the plane up to 20,000 feet over the next 50 miles. What should be his angle of elevation to the nearest tenth?
*Wednesday, January 8, 2014 at 5:28pm*

**trig**

Two Airplanes leave an airport at the same time on different runways. One flies on a bearing of N66degreesW at 325 miles per hour. The other airplane flies on a bearing öf S26degreesW at 300 miles per hour. How far apart will the airplanes be after 2 hours?
*Monday, January 6, 2014 at 9:59am*

**algebra 2 trig**

if log3=a then log300 can be expressed as? 1) 100a 2)a+2 3)100+a 4)3a
*Saturday, January 4, 2014 at 4:54pm*

**trig**

From a tower 57 ft high two objects in a straight line from it are sighted at angles of depression of 27degrees and 40degrees5' respectively. Find the distance between the two objects.
*Thursday, January 2, 2014 at 7:40am*

**trig**

A lighthouse is 14 miles east of a dock. A ship sails N33degreesE from the dock. What will be its bearing from the lighthouse after having sailed 10 miles?
*Thursday, January 2, 2014 at 7:33am*

**trig**

Illustrate and solve. A monument near a dock is 12 miles east of a ship. After the ship has sailed 7 miles, the monument bears N62degreesE. In what direction is the ship sailing?
*Thursday, January 2, 2014 at 7:26am*

**trig**

A plane flies 75 miles south from an airfield, and then travels 120 miles more in a different direction. By this time it bears S29degreesE of the airfield. In what direction is it heading. illustrate and solve.
*Thursday, January 2, 2014 at 7:19am*

**trig**

The angle of depression of the top and bottom of a tower as seen from the top of a 100m high cliff are 30degree and 60degree respectively. find the height of the tower
*Saturday, December 28, 2013 at 9:58am*

**3-D Coordinates Polar coordinates Precalculus Trig**

The U.S.S. Lollipop is on assignment in the Atlantic Ocean. It travels from a longitude of 70 degrees west to 20 degrees west, along the latitude of 40 degrees north. How far does it travel? (Assume that the radius of the Earth is 6,400 km.) Erm I don't know how to solve ...
*Wednesday, December 18, 2013 at 10:59am*

**Please help trig proof**

((cotx+cscx)/(sinx+tanx))=cotxcscx Please prove left side equal to right side, only doing doing work on the left.
*Monday, December 16, 2013 at 8:55pm*

**Simplifying trig expression**

sin(x+90) = ? cos(x+90) = ? Would the first equal like -sin(x)? Would the second equal uh -cos(x)? I'm not quite sure :/
*Monday, December 16, 2013 at 2:36pm*

**Math - Trig**

From the foot of a building I have to look upwards at an angle of 22degrees 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 50degrees to look at the top of the tree. a. How tall is the tree...
*Saturday, December 14, 2013 at 7:36pm*

**Math - Trig**

An observer on the ground at point A watches a rocket ascend. The observer is 120 feet from the launch point B. As the rocket rises, the distance d from the observer to the rocket increases. a. Express the measure of angle A in terms of d. b. Find the measure of angle A if d...
*Saturday, December 14, 2013 at 7:34pm*

**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 18Â° and Diego ...
*Thursday, December 12, 2013 at 9:51pm*

**math - trig**

The airport meteorologists keep an eye on the weather to ensure the safety of the flights. One thing they watch is the cloud ceiling. The cloud ceiling is the lowest altitude at which solid cloud is visible. If the cloud ceiling is too low the planes are not allowed to take ...
*Thursday, December 12, 2013 at 6:06am*

**math - trig**

A submersible traveling at a depth of 250 feet dives at an angle of 15º with respect to a line parallel to the water’s surface. It travels a horizontal distance of 1500 feet during the dive. What is the depth of the submersible after the dive?
*Thursday, December 12, 2013 at 6:00am*

**math - trig**

The tallest television transmitting tower in the world is in North Dakota, and it is 2059 feet tall. If you are on level ground exactly 5280 feet (one mile) from the base of the tower, what is your angle of elevation looking up at the top of the tower?
*Thursday, December 12, 2013 at 6:00am*

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