Tuesday

October 6, 2015
**Trigonometry - Identities and proof**

Show that cot((x+y)/2) = - (sin x - sin y)/(cos x - cos y) for all values of x and y for which both sides are defined. I tried manipulating both sides in terms of trig identities but I don't really have a solution....help would be appreciated, thanks.
*Wednesday, November 13, 2013 by Sam*

**Math-Trigonometry**

Show that if A, B, and C are the angles of an acute triangle, then tan A + tan B + tan C = tan A tan B tan C. I tried drawing perpendiculars and stuff but it doesn't seem to work? For me, the trig identities don't seem to plug in as well. Help is appreciated, thanks.
*Wednesday, November 6, 2013 by Sam*

**Math - Trigonometry**

If sin theta +cos theta =1.2, then what is sin^3 theta + cos^3 theta? Hmm...I don't understand how to proceed. I know I must apply a trig Identity, but which one? Thanks in advance
*Tuesday, November 5, 2013 by Sam*

**MATH ANALYSIS & TRIG**

At noon, Al is 6km north of point O traveling south at 10km/h. Also at noon, Barb is 2km east of point ) traveling east at 5km/h. A) express the distance "d" between Al and Barb as a function of time "t" hours after noon. B) Find the time at which the ...
*Tuesday, October 29, 2013 by francis*

**pre-calc/ trig**

Sinx=0
*Tuesday, October 15, 2013 by Amy*

**Math - Trig**

The equation y = 20sin(0.5θ - 2) + 40 models the monthly temp for a certain city. Use the equation to predict the temperature in the city during December. Thanks
*Thursday, October 10, 2013 by Lilly*

**Trig**

a child puts beads on one spoke of a bicycle wheel. the tire has a diameter of 2ft. if the child rides so that the tire makes one full rotation every 15 sec, and the beads begin in the horizontal outward position, find an equation that models the position of the beads at time t.
*Monday, October 7, 2013 by Bailey*

**MathsSs triG**

Consider sin(x-360)sin(90-x)tan(-x)/cos(90+x) 1.A.SIMPLIFY sin(x-360)sin(90-x)tan(-x)/cos(90+x) to a single trigonometric ratio B.hence or otherwise without using a calculator,solve for X if 0<X<360. sin(x-360)sin(90-x)tan(-x)/cos(90+x) =0,5 2.A.prove that 8/sin^2A - 4/1...
*Thursday, October 3, 2013 by katlego ratsoma*

**Trig**

2x^2+2x>4
*Sunday, September 29, 2013 by Kiki*

**math - trig**

Suppose ABC is a right triangle with sides of lengths a, b, and c and right angle at C. Find the unknown side length using the Pythagorean Theorem and find the following trigonometric functions of the indicated angle. Given: a = 4 and b = 7 Find: sin A, cot B, sec A, tan B
*Wednesday, September 25, 2013 by Annika*

**Trig**

(x+1)(x-4) is greater than or equal to (x-2)^2
*Monday, September 23, 2013 by Kiki*

**Trig**

Rewrite the expression (tan A)(cot A) in terms of a single trigonometric ratio.
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

Use the equation mg sin A = umg cos A to determine the angle at which a waxed wood block on an inclined plane of wet snow begins to slide. Assume the coefficient of friction, u, is 0.17.
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

Find the exact value of sin π/12.
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

Evaluate and simplify cos(-15º). Hint: Substitute 30º-45º for -15º.
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

Suppose sin A = 12/13 with 90º≤A≤180º. Suppose also that sin B = 7/25 with -90º≤B≤0º. Find tan (A - B).
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

Suppose sinA = 12/13 with 90º≤A≤180º. Suppose also that sinB = -7/25 with -90º≤B≤0º. Find cos(A - B).
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A + B).
*Tuesday, September 17, 2013 by Anonymous*

**Trig**

suppose tan theta equal 4 and theta lies in the third quadrant. find the values of sec theta
*Friday, September 13, 2013 by Broskie*

**trig**

Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A - B).
*Thursday, September 12, 2013 by Matt*

**trig**

Evaluate and simplify tan 5π/12.
*Thursday, September 12, 2013 by Matt*

**trig**

This identity means that translating a basic sine graph 3π/2 units to the right produces a basic cosine graph. True or False? sin(X-(3(pi)/2)) = cosX
*Thursday, September 12, 2013 by Matt*

**trig**

How do you solve sin(e^x)=0 for x? The question is "find the smallest number x such that sin(e^x)=0".... but I can't even get AN answer lol! Much appreciated!
*Wednesday, September 11, 2013 by Luna*

**trig**

How do you solve sin(e^x)=0 for x? The question is "find the smallest number x such that sin(e^x)=0".... but I can't even get AN answer lol! Much appreciated!
*Wednesday, September 11, 2013 by Luna*

**trig**

if 60 m of fencing is available for a rectangular garden, one side of which is against a barn, what areb the dimensions of the garden that will give the maximum area?
*Thursday, August 29, 2013 by Anonymous*

**trig**

u = (9, 2) v = (-5, -2) 2u - 3v = ?
*Wednesday, August 28, 2013 by Vanessa*

**Trig hep, please? Thank you!**

1. Find the exact value of sin(195(degrees)) 2. If cot2(delta)=5/12 with 0(<or =)2(delta)pi, find cos(delta), sin(delta) , tan(delta). 3.find the exact value of sin2(x) if cos(x)= 4/5. (X is in quadrant 1) 4. Find the exact value of tan2(x) if sin(x)=5/13. ((X) in quadrant ...
*Saturday, August 17, 2013 by Michelle*

**trig help much appreciated! :))**

1. Find the complete exact solution of sin x = . 2. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 3. Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two decimal places. 4. Prove that tan2 – 1 + cos2 = ...
*Friday, August 16, 2013 by suzy *

**trig**

prove that :cosA-sinA+1/cosA+sinA-1=cosecA+cotA
*Friday, August 16, 2013 by rajan *

**trig**

PROVE: Cos 2theta = .5 (cot theta - tan theta) Please help me
*Wednesday, August 14, 2013 by Mike*

**Trig**

Given that csc θ = -4 and tan θ > 0, find the exact value of a. x b. sin θ c. cos θ d. r e. sec θ f. cot θ
*Wednesday, August 7, 2013 by Paula*

**Trig**

Given that tan θ = - (√3/8) and θ is in QII, find the exact value of a. r = b. csc θ c. cos θ d. cot θ
*Wednesday, August 7, 2013 by Paula*

**Trig**

Given that cos θ = 5/13 and θ is in QIV, find the exact value of a. y b. sin θ c. sec θ d. tan θ
*Wednesday, August 7, 2013 by Paula*

**trig**

tan200(cot10-tan10)
*Friday, August 2, 2013 by Pallav *

**trig**

tan200(cot10-tan10)
*Friday, August 2, 2013 by Pallav *

**trig**

Find all solutions of cos (x) + 1/2 sec (x) = -3/2 in the interval (2pi, 4pi) (Leave your answers in exact form and enter them as a comma-separated list.)
*Wednesday, July 31, 2013 by Holly*

**trig**

the base of a trapezoid are 22 and 12 respectively. the angle at the extremities of one base are 65 degree and 45 degree respectively. find two legs?
*Wednesday, July 31, 2013 by kathy*

**trig**

Given that P=(-1,8) and Q=(-2,1), find the component form and magnitude of the vector 3 PQ.
*Sunday, July 28, 2013 by tony*

**trig**

Which expression is equivalent to csc x - sin x?
*Monday, July 22, 2013 by Lois*

**trig**

use a half-angle identity to find the exact value of tan 105 degrees.
*Monday, July 22, 2013 by Karen*

**trig**

Write the standard form of the equation where p=π and o=7π/12
*Monday, July 22, 2013 by Sharla*

**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 tenth.
*Monday, July 22, 2013 by Jackie*

**Trig**

Find all solutions in the interval 0 degrees<θ<360 degrees. If rounding necessary, round to the nearest tenth of a degree. 17sec2 θ − 15tanθsecθ − 15 = 0
*Monday, July 22, 2013 by Lisa*

**trig**

A barge is pulled by two tugboats. The first tugboat is traveling at a speed of 12 knots with heading 140°, and the second tugboat is traveling at a speed of 17 knots with heading 200°. Find the resulting speed and direction of the barge. (Round your answers to the ...
*Sunday, July 21, 2013 by Priscilla*

**trig**

An object suspended from a spring is oscillating up and down. The distance from the high point to the low point is 30 cm, and the objects take 4 sec to complete 5 cycles.For the first few cycles the distance from the mean position, d(t), in cm with respect to the time t sec is...
*Saturday, July 20, 2013 by Azal - pleaseee helpp*

**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) test your predictions ...
*Saturday, July 20, 2013 by Azal*

**trig**

tan(7π/4) + tan(5π/4) Does this = 0
*Thursday, July 18, 2013 by tony*

**trig **

each wheel of a bicycle is of radius is 1.1 ft. if the wheels are making 4 revoultions per second how fast is the bicycle moving
*Thursday, July 18, 2013 by vanessa *

**Calculus**

Find the positive value of x which satisfies x = 4.3cos(x). Give the answer to six places of accuracy. Remember to calculate the trig functions in radian mode
*Wednesday, July 17, 2013 by J*

**trig**

Simplify: csc^2 x sec x / sec^2 x + csc^2 x
*Tuesday, July 16, 2013 by tony*

**college trig**

find the radius of a pulley if rotating the pulley 108.03 degrees raises the pulley 37.3mm
*Monday, July 15, 2013 by brandi*

**trig**

simplify the expression. tan(π/2-x)tanx
*Sunday, July 14, 2013 by tony*

**trig**

simplify the expression. cos^2x+sin^2x/cot^2x-csc^2x
*Sunday, July 14, 2013 by tony*

**trig**

simplify the expression. (sin^2x+cos^2x) - (csc^2x-cot^2x)
*Sunday, July 14, 2013 by trig*

**trig**

simplify the expression. cot^2(x)-csc^2(-x)
*Sunday, July 14, 2013 by trig*

**trig**

simplify the expression. -sin^2x-cos^2x
*Saturday, July 13, 2013 by tony*

**trig**

use basic identities to simplify the expression. csc θ cot θ / sec θ
*Saturday, July 13, 2013 by tony*

**(pls help) Trig**

point P and Q are respectively 24m north and 7m east of point R. What is bearing of Q and P to the nearest whole degree.(a)52(b)164(c)134(d)159
*Sunday, July 7, 2013 by david*

**trig**

A turntable in a shop makes 36 revolutions per minute. How many revolutions does it make per second? My answer is 216 revolutions per second. Am I right? Thanks.
*Saturday, July 6, 2013 by Perrie*

**trig**

Through how many degrees does the minute hand of a clock moves in 5 minutes? In 1 1/2 hours?
*Saturday, July 6, 2013 by Perrie*

**Trig**

Suppose a CD player makes 48 revolutions per minute. Through how many degrees will a point on the edge of a CD move in 1 minute? In 2 sec?
*Friday, July 5, 2013 by Jade*

**Trig**

A tire is rotating 600 times per minute. Through how many degrees does a point on the edge of the tire move in 1 minute?
*Friday, July 5, 2013 by Jade*

**trig**

Find all solutions in the interval [0,2pi]. sin 2x + sin x = 0
*Thursday, July 4, 2013 by Trig*

**trig**

Find all real numbers in the interval [0,2pi) that satisfy the equation. cos^2 x+2 cos x+1 = 0
*Thursday, July 4, 2013 by Trig*

**Trig**

Multiply and Simplify. ( 1 + cot θ )^2
*Thursday, July 4, 2013 by Trig*

**trig**

A wheel with a 24-inch diameter is turning at the rate of 32 revolutions per minute. To the nearest inch per minute, what is the linear velocity of a point on the rim?
*Wednesday, July 3, 2013 by helo*

**trig, math**

Given triangle ABC with a = 16, b = 14, and β = 54°, find the value of c.
*Wednesday, July 3, 2013 by Matthew*

**trig, math**

A 175-pound force and a 230-pound force are acting on the same point in directions that differ by 42°. What is the angle that the resultant makes with the 175-pound force?
*Wednesday, July 3, 2013 by John*

**Trig**

Determine the number of triangles with the given parts. b=24 c=29 B=40deg I got 1
*Tuesday, July 2, 2013 by Helay*

**trig**

Find all solutions of the equation. Leave answers in trigonometric form. x^5-1024=0 I got 4(cos tehta + i sin tehta), tehta = 0, 2pi/5, 4pi/5, 6pi/5, 8pi/5 is this right
*Tuesday, July 2, 2013 by haley*

**trig, math**

Which of these functions has period 7? A)y= cot 7/pi x B)y= tan pi/7 x C)y= sin 7/pi x D)y= cos pi/7 x
*Monday, July 1, 2013 by John*

**trig**

Write the complex number in trigonometric form, using degree measure for the argument. -12 - 16i
*Friday, June 28, 2013 by tony*

**trig**

Convert the rectangular coordinates to polar coordinates, using radian measure for the angle. (6, -6) 6√(2),7π/4 OR -6√(2),5π/4
*Friday, June 28, 2013 by tony*

**trig**

Solve the equation. Express your answer in trigonometric form. x^5 - 11 = 0
*Friday, June 28, 2013 by tony*

**trig**

Find the indicated roots. Write the answer in trigonometric form. Fourth roots of 256(cos 220° + i sin 220°)
*Friday, June 28, 2013 by tony*

**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 by tony*

**trig**

Find the dot product a*b. a= (5,-9), b=(4,-3)
*Friday, June 28, 2013 by tony*

**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 by tony*

**trig**

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

**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 by John*

**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 by Mason*

**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 by tony*

**trig**

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

**trig**

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

**trig**

choose the expression that is equivalent to the given expression. 2 cos^2 4x-1
*Friday, June 21, 2013 by tony*

**trig**

Use the fundamental identities to simplify the expression. cos^2θ/sin^2θ+cscθsin_2; I got tan^2theta
*Friday, June 21, 2013 by tony*

**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 by tony*

**trig**

Multiply and simplify. (cos x - sin x)^2
*Friday, June 21, 2013 by tony*

**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 by tony*

**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 by tony*

**trig**

Solve the right triangle with the given sides and angles. a = 3.0, B = 31.0°
*Friday, June 21, 2013 by tony*

**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 by sara*

**trig**

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

**trig**

Find all real numbers in [0, 2π) that satisfy the equation. cos 2x = √(2)/2
*Monday, June 17, 2013 by tony*

**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 by tony*

**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 by tony*

**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 by tony*

**trig**

if 5sin theta + 12cos theta is equal to 13 find the value of tan theta
*Saturday, June 15, 2013 by Anonymous*

**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 by Lauren *

**trig**

for the given angle, name the quadrant in whihc the terminal side lies. -350deg
*Wednesday, June 12, 2013 by tony*