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March 5, 2015

March 5, 2015

**Recent Homework Questions About Trigonometry**

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**trig**

Find the indicated roots. Write the answer in trigonometric form. Fourth roots of 256(cos 220° + i sin 220°)
*Friday, June 28, 2013 at 12:38pm*

**trig**

Use De Moivre's theorem to simplify the expression. Write the answer in a + bi form. [2(cos 240° + i sin 240°)]^5
*Friday, June 28, 2013 at 12:08pm*

**trig**

Find the dot product a*b. a= (5,-9), b=(4,-3)
*Friday, June 28, 2013 at 11:36am*

**trig**

estimate the components of the vector. Round to one decimal place. [v] = 33.9, θ = 65.9° Find the horizontal and vertical components of v, and write in component form.
*Friday, June 28, 2013 at 11:30am*

**trig**

find the indicated vector. let u = (-9,1), v=(-5,9). Find 3u+v
*Friday, June 28, 2013 at 11:28am*

**trig, math**

In a right triangle with g the right angle, b = 86.5 and c = 125.8. What is β ?
*Thursday, June 27, 2013 at 12:26pm*

**trig, math**

A stairway must be built to a deck that is 20 feet above ground level. To the nearest half foot, how far from the base of the deck, on ground level, should the beginning of the stairway be placed so that the stairway forms a 60° angle from the ground?
*Thursday, June 27, 2013 at 11:41am*

**trig**

Find z1z2 and z1/z2 for the pair of complex numbers using trigonometric form. z1=4+9i, z2=-5-5i I got z1z2 = 25-65i But cannot find the z1/z2.
*Wednesday, June 26, 2013 at 10:12pm*

**trig**

slove the equation exactly over the interval [0, 2pi) sinx=1-2sin^2x
*Friday, June 21, 2013 at 1:13pm*

**trig**

use an identity to write the expression as a single trignometric function. squ root 1-cos48°/2
*Friday, June 21, 2013 at 1:07pm*

**trig**

choose the expression that is equivalent to the given expression. 2 cos^2 4x-1
*Friday, June 21, 2013 at 12:53pm*

**trig**

Use the fundamental identities to simplify the expression. cos^2θ/sin^2θ+cscθsin_2; I got tan^2theta
*Friday, June 21, 2013 at 12:46pm*

**trig**

fidn all values of tehta in [0, 360) that satisfy the equation. √(3)tan(θ/2)=-1 I have four choices 300, 330, 150 , 120 and i got 120
*Friday, June 21, 2013 at 12:40pm*

**trig**

Multiply and simplify. (cos x - sin x)^2
*Friday, June 21, 2013 at 12:36pm*

**trig**

Choose the expression that is equivalent to the given expression. sin 6x tan 3x I got 2 sin^2 3x
*Friday, June 21, 2013 at 12:33pm*

**trig**

Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression. 2tan 2pi/3 / 1-tan^2 2pu/3
*Friday, June 21, 2013 at 12:26pm*

**trig**

Solve the right triangle with the given sides and angles. a = 3.0, B = 31.0°
*Friday, June 21, 2013 at 11:46am*

**Physics (trig)**

The height of an outdoor basketball backboard is 12 1/3 feet and the backboard casts a shadow 19 1/5 feet. Find the angle of elevation of the sun (answer in units of degrees). Can someone help me with the formula? Thank you!
*Wednesday, June 19, 2013 at 9:10pm*

**trig**

Find all values of ¸ in [0°, 360°) that satisfy the equation. 2 sin 2θ - √(3) = 0
*Monday, June 17, 2013 at 9:47am*

**trig**

Find all real numbers in [0, 2π) that satisfy the equation. cos 2x = √(2)/2
*Monday, June 17, 2013 at 9:46am*

**trig**

Find all angles in degrees that satisfy the equation. Round approximate answers to the nearest tenth of a degree. tan α = -1.85
*Monday, June 17, 2013 at 12:58am*

**trig**

Use a sum or difference identity to find the exact value. tan 25deg + tan 5deg / 1-tan 25deg tan 5deg
*Monday, June 17, 2013 at 12:40am*

**trig**

Find cos(A+B). cos A=1/3 and sin B=-1/2, with A in quadrant I and B in quadrant IV.
*Sunday, June 16, 2013 at 11:20pm*

**trig**

if 5sin theta + 12cos theta is equal to 13 find the value of tan theta
*Saturday, June 15, 2013 at 8:41am*

**Algebra 3 and trig**

An ocean liner is 177 miles due west of lighthouse A. Lighthouse B is 265 miles due south of lighthouse A. Find the distance from lighthouse B to the liner and the bearing of the ocean liner from lighthouse B.
*Wednesday, June 12, 2013 at 6:22pm*

**trig**

for the given angle, name the quadrant in whihc the terminal side lies. -350deg
*Wednesday, June 12, 2013 at 2:25pm*

**trig**

identify the quadrant in which 0 lies. sin < 0 and sec > 0
*Wednesday, June 12, 2013 at 2:02pm*

**trig**

determine the period of the function. y = cot 4t
*Wednesday, June 12, 2013 at 1:26pm*

**trig**

Identify the quadrant in which θ lies. sin > 0 and tan < 0
*Tuesday, June 11, 2013 at 7:59pm*

**trig**

Find the trigonometric function value of angle θ. Cos θ = 2/7 and θ is in quadrant IV. Find sin θ.
*Tuesday, June 11, 2013 at 7:30pm*

**trig**

The point (-3, 4) is on the terminal side of angle θ in standard position. Find cot θ.
*Tuesday, June 11, 2013 at 7:24pm*

**trig**

Given that θ is an angle in standard position whose terminal side contains the given point, provide the exact value of the indicated function. (-2, -3) Find sec θ.
*Tuesday, June 11, 2013 at 4:31pm*

**trig**

ferris wheel one has a 40ft diameter, revolves once every 30 seconds and is 5ft above ground. Ferris wheel two has a diameter of 20feet, revolves once every 15seconds and is 2 feet above the ground. each angular velocity?? each linear velocity??
*Tuesday, June 11, 2013 at 3:26pm*

**math - trig**

1. Find csc A, cos A and tan A of an angle A whose terminal side contains (– 12, – 5). 2. Find sin X, sec X and cot X of an angle X whose terminal side contains (– 3, 5).
*Tuesday, June 11, 2013 at 4:11am*

**Trig**

The angle of elevation from a point on the ground to the top of a tower is 37deg5'. The angle of elevation from a point 120 feet farther back from the tower is 29deg5'. Find the height of the tower (to the nearest foot).
*Monday, June 10, 2013 at 7:06pm*

**Math Help**

Permutation and combinations (Trig/alg2 class) In how many ways can all the letters in SEYCHELLES be arranged?
*Sunday, June 9, 2013 at 11:51pm*

**MATH - **

Permutation and combinations (Trig/alg2 class) In how many ways can all the letters in SEYCHELLES be arranged?
*Sunday, June 9, 2013 at 2:52pm*

**Trig**

Find the reference angle θ'. θ= -7pi/9
*Saturday, June 8, 2013 at 11:55pm*

**Trig**

Find the area of a sector with the given central angle θ in a circle of radius r. θ = 90°, r = 6 cm
*Saturday, June 8, 2013 at 11:03pm*

**Math Trig Find Quadrant I II III IV**

In which quadrant is the terminal side of angle A? A = -5π/6 a. Quadrant III b. Quadrant I c. Quadrant II d. Quadrant IV
*Saturday, June 8, 2013 at 10:49pm*

**trig**

what are the values of the angle in the interval 0<the angle<360 that satisfy the equation tan beta- radical 3=o
*Thursday, May 30, 2013 at 10:57pm*

**trig**

If (m+2)sin ø + (2m-1)cos ø = 2m+1 then tan ø is equal to
*Wednesday, May 29, 2013 at 2:54am*

**Math-Trig**

A ball is tossed up in the air at an angle of 70 degrees with the horizontal and with an initial velocity of 36 ft/sec. What is the position of the ball 1 second after it is released? When will the ball hit the ground? What is the maximum height the ball will reach? How far in...
*Tuesday, May 28, 2013 at 2:47pm*

**trig**

A security camera needs to be set so that the angle of view includes the area from a doorway to the edge of a parking lot.The doorway is 16m from the camera. the edge of the parking lot is 24m for the camera. the doorway is 28m from the edge of the parking lot. what angle of ...
*Monday, May 27, 2013 at 12:49am*

**trig**

in the diagram below.A,B and C are three points in the same horizontal plane and AD is a vertical tower.AC=AB=x and DC=DB.the angle of elevetion of D from C is alpha and DB^C=theta 1.express DC in terms of x trigonometry value of alpha 2.prove that BC=2xcostheta/cos alpha
*Sunday, May 26, 2013 at 10:54am*

**trig**

please am stucked help me.in the diagram below.A,B and C are three points in the same horizontal plane and DC is a vertical tower.AC=AB=x and D^C=DB.the angle of elevation of D from C is alpha and DB^C=theta
*Sunday, May 26, 2013 at 7:31am*

**How to get quick responses to your math questions**

Math is a wide subject, ranging from K to 11, college and university. Then there is algebra, trigonometry, geometry, arithmetic, calculus, number theory, ... etc. Not all teachers answer all math questions (many do). If you would give a little more detail on which branch of ...
*Saturday, May 25, 2013 at 9:45am*

**trig**

A hiker walks 900m east and 500m south .Find the bearing of the finishing position from the staring point?
*Saturday, May 25, 2013 at 3:44am*

**trig**

TRIG Identities, Gr. 12: Prove: cot4x=1-tan^2x/2tan2x
*Thursday, May 23, 2013 at 2:56pm*

**TRIG Help help help test tommarow**

A TV tower stands on top of the Empire State building. From a point (on the ground) 1150 feet from the base of the building, the angle of elevation to the top of the TV tower is 52 degrees. If the building is 1250 feet tall, what is the length of the TV tower?
*Wednesday, May 22, 2013 at 6:48pm*

**TRIGONOMETRY**

Can someone please give me a step by step answer on how to find the complex cube roots of 8(cos(4π/5)+isin(4π/5))? I need to know how to do this for my trig final next week.
*Friday, May 17, 2013 at 5:01pm*

**TRIGONOMETRY**

I don't understand how to convert -3-4i to polar coordinates. I need to know how so I am ready for my trig final next year. Can someone please show me step by step how to solve this? Thanks
*Friday, May 17, 2013 at 3:31pm*

**TRIGONOMETRY**

Can someone please show me step by step how to calculate the modulus and the argument for these complex numbers? I have a trig final next week and I am trying to finish this study guide so I am prepared. Thank you so much! If you can, please show my how you get the answer so I...
*Friday, May 17, 2013 at 9:11am*

**TRIGONOMETRY**

Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each ...
*Thursday, May 16, 2013 at 11:29am*

**TRIGONOMETRY**

Can you check my work, please? This is for a trig study guide for my final next week. I'd like to know if I'm doing this right. :) 2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) ...
*Thursday, May 16, 2013 at 11:26am*

**TRIGONOMETRY**

Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
*Thursday, May 16, 2013 at 11:13am*

**trig**

Sinxcosy(cotxtany-1)
*Wednesday, May 15, 2013 at 12:16pm*

**trig**

Sinxcosy(cotxtany-1)
*Wednesday, May 15, 2013 at 12:15pm*

**trig**

There are 15,000 endive lettuce seeds in an ounce and 300 seeds in a packet. The seeds cost $1.50 per packet. What is the cost, in dollars, of one ounce of seeds?
*Wednesday, May 15, 2013 at 10:04am*

**trig**

if 5cos A plus 3=0 and 180<A<360..without using a calculator and with the aid of a diagram,determine the value of 1.1 sinA plus cosA 1.2 tanA *sinA
*Monday, May 13, 2013 at 11:52am*

**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?
*Sunday, May 12, 2013 at 11:32pm*

**TRIG**

in an arithmetic sequence a1=4 and d=8 which term is 428 Show your work
*Saturday, May 11, 2013 at 8:32pm*

**TRIG**

what is the explicit formula for the sequence 3,7,11,15
*Saturday, May 11, 2013 at 8:30pm*

**TRIG**

determine the sum of the first 100 even integers SHOW YOUR WORK
*Saturday, May 11, 2013 at 8:29pm*

**TRIG**

the population of a certain city is 1.3 million people. if the population is growing at the rate of 4% per year what will the population be in 8 years
*Saturday, May 11, 2013 at 8:28pm*

**TRIG**

What is the 6th term of the geometric series with a1= -5 and r=2.5
*Saturday, May 11, 2013 at 8:25pm*

**trig identites**

since sin2x+√3cos2x=2sin(2x+60) find the general solution for the equation sin2x+√3cosx=0 thank you
*Friday, May 10, 2013 at 7:35pm*

**math**

simplify sin(540-2x) this is to do with trig
*Friday, May 10, 2013 at 10:13am*

**Trig**

Verify the identity. (secx + tanx)/(secx - tanx) = (1 + 2sinx + sin(^2)x)/cos(^2)x
*Thursday, May 9, 2013 at 2:16pm*

**Trig**

Verify the identity. 1/(tanx-secx) + 1/(tanx+secx) = -2tanx
*Thursday, May 9, 2013 at 1:54pm*

**math trig**

If a ferris wheel with a 20.5 meter radius, how high would one car be from the loding dock at these given angles trveled by the rider?: 90 135 180 225 270 315 405 450 495 and 540?
*Thursday, May 9, 2013 at 10:40am*

**math trig**

If a ferris wheel has a radius of 20.5meters, how tall would a 45 degree angle be?
*Thursday, May 9, 2013 at 10:28am*

**Honors Trig**

a plane is flying in the direction of 190 degrees with an air speed of 400 mph. Its course and ground speed are 200 degrees and 350 mph respectively. What is the speed and direction of the wind?
*Wednesday, May 8, 2013 at 6:30pm*

**trig**

The angle of depression as measured from the top of a 41 foot tower to a reference point on the ground is 65 degrees. How far away, to the nearest foot, is the reference point from the base of the tower?
*Wednesday, May 8, 2013 at 2:41pm*

**Trig**

Use sum and difference identitites to find the exact value of co 15 degrees
*Wednesday, May 8, 2013 at 11:56am*

**trig identities**

Find the exact value of cos (2theta) given csc theta = 8/3 and 0 < theta < pi/2
*Wednesday, May 8, 2013 at 1:02am*

**trig**

find the minimum and maximum value of sin100 degree plus cos100 degree
*Tuesday, May 7, 2013 at 4:36pm*

**trig**

If a flywheel 8 ft. in diameter rotates at 80 rpm., what is the linear velocity of a point on the outside edge, in feet per minute in terms of pi?
*Tuesday, May 7, 2013 at 9:43am*

**Trig**

cos[(tan^-1(3/4))+(cos^-1(9/41))]
*Monday, May 6, 2013 at 10:10pm*

**Trig **

csc thea= -2, quadrant 4. what are the six trig functions?
*Monday, May 6, 2013 at 4:17pm*

**trig**

A slide is attached to the side of a tree house. The height of the tree house is 6 less than double the distance from the baswe of the tree to the base of the slide. The length of the slide is 3 more than the height of the tree house. Find the length of the slide.
*Sunday, May 5, 2013 at 9:00pm*

**Advanced Functions/Trig**

Prove the identity: cos^4 x + sin^4 x = 1 - (1/2)sin^2 (2x)
*Sunday, May 5, 2013 at 11:16am*

**Trig(I think)**

Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 1m/s, how fast is the area of the spill increasing when the radius is 30m?
*Monday, April 29, 2013 at 8:02pm*

**trig**

at one point in the day, a tower that is 150 feet high casts a shadow that is 210 feet long. Find, to the nearest tenth of a degree, the angle of elevation of the sun at that point
*Sunday, April 28, 2013 at 12:10pm*

**trig**

cos(t)=3/5 determine the exact value of t to the nearest degree
*Saturday, April 27, 2013 at 3:39pm*

**trig**

solve the point given below is on the terminal side of an angle0. find the exact value of the six trigonometric functions of 0. (10,-10)
*Saturday, April 27, 2013 at 2:27pm*

**trig**

how many solutions (answers) does this equation has? sinx=sin1
*Saturday, April 27, 2013 at 1:53pm*

**trig**

how to do this? how much does this equals? 2cos160*cos140*cos100
*Saturday, April 27, 2013 at 1:49pm*

**trig**

Convert 11pi/5 radians into degrees.
*Wednesday, April 24, 2013 at 1:45pm*

**trig**

Convert 11pi/5 radians into degrees.
*Wednesday, April 24, 2013 at 1:45pm*

**Trig**

A parabola has its vertex on the graph of the line y=3x+1 and passes through (1,10). If it is the same size,? shape, and direction as the graph of y=3x^2, find the equation (s) of all possible parabolas Thanks!!!
*Wednesday, April 24, 2013 at 6:39am*

**Trig**

Convert 2xy = 1 to polar form.
*Monday, April 22, 2013 at 7:04pm*

**Trig**

Rewrite -2x^2 + sqrt(3)xy - y^2 +2 = 0 with the xy term eliminated. Round terms to nearest hundredth.
*Monday, April 22, 2013 at 6:39pm*

**trig**

A kite is in the shape of a quadrilateral with two pair of congruent adjacent sides. The lengths of two sides are 20.0 inches and the lengths of the other two sides are 35.0 inches. The two shorter sides meet at an angke of 115 degrees. A. Find the length of the diagonal ...
*Sunday, April 21, 2013 at 6:09pm*

**trig**

Two tracking stations are on the equator 135 miles apart. A weather balloon is located on a bearing of N 37 degrees E from the weastern station and on a bearing of N 19 degrees E from the eastern station. How far is the balloon from the weastern station?
*Sunday, April 21, 2013 at 3:32pm*

**trig**

A pole is braced by two wires that extended from the top of the pole to the ground. The lengths of the wires are 16 feet and 18 feet and the measure of the angle between the wires is 110 degrees. Find, to the nearest foot, the distance between the points at which the wires are...
*Sunday, April 21, 2013 at 2:45pm*

**Trig**

A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.
*Sunday, April 21, 2013 at 1:05pm*

**Advanced Functions/Trig**

Prove the following: sin(x+y)sin(x-y) = cos^2 (y) - cos^2 (x)
*Sunday, April 21, 2013 at 11:47am*

**Trig**

This has to do with vectors...I'm wondering if I set up the diagram correctly? A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane?
*Saturday, April 20, 2013 at 4:50pm*

**Trig**

This has to do with dot products (I can't make the arrow above the u, i, or j). Given u = 4i - 6j and v = -3i + 5j, find 4u-(1/2)v Am I just supposed to plug in what u and v are equal to in 4u-(1/2)v? If so, is the answer (35/2i - 53/2j)
*Saturday, April 20, 2013 at 4:15pm*

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