Friday

February 27, 2015

February 27, 2015

**Recent Homework Questions About Trigonometry**

Post a New Question | Current Questions

**Trig**

To avoid a steep descent, an airplane flying at 10,000m starts its descent 60km away from the airport. For the angle of descent to be constant, at what angle should the plane descend?
*Saturday, December 7, 2013 at 8:08pm*

**Trigonometry/Geometry - Inequalities**

Let a, b, and c be positive real numbers. Prove that sqrt(a^2 - ab + b^2) + sqrt(a^2 - ac + c^2) is greater or equal to sqrt(b^2 + bc + c^2). Under what conditions does equality occur? That is, for what values of a, b, and c are the two sides equal? This looks like a geometry...
*Saturday, December 7, 2013 at 4:58pm*

**Math-Trig**

1. To avoid a steep descent, an airplane flying at 10 000 m starts its descent 60km away from the airport. For the angle of descent to be constant, at what angle should the plane descend? 2. A flagpole that is 20m high casts a shadow that is 18m long. What is the angle of ...
*Thursday, December 5, 2013 at 8:09pm*

**Math - Trig**

1. When you look down from the top of a building at an angle of 63degrees, you will see a man reading a newspaper. If the building is 50m high, how far is the man from the building? 2. A plane takes off at an angle of 15deg20'. How high will it have risen after it has ...
*Thursday, December 5, 2013 at 7:31pm*

**Trig-Weird Geometry Problem**

Determine all triangles ABC for which tan(A-B)+tan(B-C)+tan(C-A)=0. There's a hint: "Can you relate A-B to B-C and C-A?" Should I apply the tangent difference formula (tan(x-y))? Help would be appreciated, thanks.
*Thursday, December 5, 2013 at 11:02am*

**Advanced Functions/Precalculus**

Trigonometry Questions 1.) Find the exaqct value of tan(11π/12) 2.) A linear trig equation involving cosx has a solution of π/6. Name three other possible solutions 3) Solve 10cosx=-7 where 0≤x≤2π
*Wednesday, December 4, 2013 at 2:13pm*

**Math-Trig**

A helicopter hovers 105 m above the end of an island. If the angle from the helicopter down to the other end of the esland is 13deg30', find the length of the island.
*Wednesday, December 4, 2013 at 8:19am*

**Math - Trig**

1. From a point 15m from the base of a tree, the angle of elevation of the top of the tree is 46.48degrees. Approximate the height of the tree. 2. From a point 17.2m from the base of a building, the angle of elevation of the top of the building is 73.5degrees. Aproximate the ...
*Wednesday, December 4, 2013 at 12:11am*

**trig**

find cos(θ)ˏsin(θ)ˏtan(θ), if cot (2θ)=5/12 with 0≤2θ≤π Answer this Que
*Wednesday, November 27, 2013 at 11:57pm*

**trig.**

a person standing 100ft. from the base of the tree looks up to the top of the tree with an angle of elevation of 52. assuming that the persons eyes are 5ft above ground the ground how tall is the tree?
*Wednesday, November 27, 2013 at 4:31pm*

**Math - Trig**

1. Given that points S and R on opposite sides of a lake, triangle SRT is formed. To find the distance RS across the lake, a surveyor lays off RT = 53.1 m, with angle T = 32deg 10' and anagle S = 57deg 50'. Find length RS.
*Wednesday, November 27, 2013 at 2:01am*

**Math - Trig**

1. Find the altitude of an isocles triangle having base 184.2 cm if the angle opposite the base is 68deg 44' 2. A 13.5m fire truck ladder is leaning against a wall. Find the distance d the ladder goes up the wall (above the top of the fire truck) if the ladder makes an ...
*Wednesday, November 27, 2013 at 1:58am*

**Trig-Geometry - Law of sines and cosines**

Hello everyone, I've been struggling on this problem for quite some time. It would be appreciated if you could help. Thanks. (The website is the diagram, it is a screenshot) In the diagram below, triangle ABC has been reflected over its median AM to produce triangle AB'...
*Sunday, November 24, 2013 at 11:01pm*

**Trig/Precalc**

a lamp post that is 8 feet high casts a shadow 5 feet long. how tall is the person standing beside the lamp post if his shadow is 3.5 feet long
*Sunday, November 24, 2013 at 6:06pm*

**Trig-Medians and law of cosines and sines**

In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Not making sense to me, I think the answer must be simple, but I don't know how to solve I applied the law of sines but to no avail. Help is appreciated, thanks.
*Wednesday, November 20, 2013 at 11:53am*

**Trig**

sin^2(34)+sin^2(48)+sin^2(56)+sin^2(42)
*Tuesday, November 19, 2013 at 10:18pm*

**Trig - Law of sines and cosines**

ABC is an equilateral triangle with side length 4. M is the midpoint of BC, and AM is a diagonal of square ALMN. Find the area of the region common to both ABC and ALMN. I drew the diagram but I don't know how to find the answer? I think it has something to do with the law...
*Tuesday, November 19, 2013 at 8:09pm*

**Trig**

sqrt(100+(10cotx)^2)
*Tuesday, November 19, 2013 at 8:02pm*

**Calculus**

1) The period of a trig. function y=sin kx is 2pi/k. Then period of y=sin^2(pi.x/a) should be 2pi/(pi/a)=2a, but somewhere it is given as a. Which is correct? 2) The period of r=sin^3(theta/3) is given as 3pi. How is it worked out? Is it because after theta=0, the function ...
*Monday, November 18, 2013 at 12:18am*

**Trig**

2 vectors act on a bolt. vector 1(1200/70 degrees) vector 2(900/205 degrees) then E = ? must show work!
*Friday, November 15, 2013 at 8:57am*

**Trig**

Plane leaves airport with heading of 110 degrees at 300 mph, the wing out of the southwest is 42 mph. locate the plane after 4 hours? find the distance back to airport and angle from due east?
*Friday, November 15, 2013 at 1:14am*

**Trig**

2 vectors act on a bolt. vector 1(1200/70 degrees) vector 2(900/205 degrees) then E = ? must show work!
*Friday, November 15, 2013 at 12:37am*

**Algebra 2 Trig - Probability Question**

help solving a probability problem: probability that a person taking a survey is male "given" that he preferred a European automobile if 112 males prefer european autos out of 188, and 216 of a total of 452 individuals were surveyed were male. Additional information...
*Thursday, November 14, 2013 at 9:13am*

**Trig**

2 vectors at a Right angle to each other are pulling on a bolt. vector 1 = 650; vector 2 = 300 then R = ?
*Wednesday, November 13, 2013 at 7:35pm*

**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 at 11:23am*

**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 at 5:21pm*

**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 at 10:26pm*

**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 at 11:25pm*

**pre-calc/ trig**

Sinx=0
*Tuesday, October 15, 2013 at 10:07am*

**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 at 12:46am*

**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 at 4:11am*

**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 at 4:22pm*

**Trig**

2x^2+2x>4
*Sunday, September 29, 2013 at 2:17pm*

**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 at 4:09am*

**Trig**

(x+1)(x-4) is greater than or equal to (x-2)^2
*Monday, September 23, 2013 at 2:57pm*

**Trig**

Rewrite the expression (tan A)(cot A) in terms of a single trigonometric ratio.
*Tuesday, September 17, 2013 at 11:24pm*

**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 at 11:24pm*

**Trig**

Find the exact value of sin π/12.
*Tuesday, September 17, 2013 at 11:23pm*

**Trig**

Evaluate and simplify cos(-15º). Hint: Substitute 30º-45º for -15º.
*Tuesday, September 17, 2013 at 11:23pm*

**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 at 11:22pm*

**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 at 11:22pm*

**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 at 11:22pm*

**Trig**

suppose tan theta equal 4 and theta lies in the third quadrant. find the values of sec theta
*Friday, September 13, 2013 at 2:03am*

**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 at 11:51pm*

**trig**

Evaluate and simplify tan 5π/12.
*Thursday, September 12, 2013 at 11:47pm*

**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 at 11:43pm*

**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 at 8:29pm*

**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 at 8:29pm*

**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 at 9:44pm*

**trig**

u = (9, 2) v = (-5, -2) 2u - 3v = ?
*Wednesday, August 28, 2013 at 3:07pm*

**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 at 10:51pm*

**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 at 4:53pm*

**trig**

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

**trig**

PROVE: Cos 2theta = .5 (cot theta - tan theta) Please help me
*Wednesday, August 14, 2013 at 3:32pm*

**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 at 5:20am*

**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 at 5:20am*

**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 at 5:19am*

**trig**

tan200(cot10-tan10)
*Friday, August 2, 2013 at 6:00am*

**trig**

tan200(cot10-tan10)
*Friday, August 2, 2013 at 5:57am*

**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 at 6:03pm*

**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 at 6:10am*

**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 at 12:45pm*

**trig**

Which expression is equivalent to csc x - sin x?
*Monday, July 22, 2013 at 8:10pm*

**trig**

use a half-angle identity to find the exact value of tan 105 degrees.
*Monday, July 22, 2013 at 8:10pm*

**trig**

Write the standard form of the equation where p=π and o=7π/12
*Monday, July 22, 2013 at 8:09pm*

**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 at 8:08pm*

**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 at 3:55pm*

**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 at 10:58pm*

**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 at 3:27pm*

**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 at 3:13pm*

**trig**

tan(7π/4) + tan(5π/4) Does this = 0
*Thursday, July 18, 2013 at 10:49pm*

**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 at 5:05pm*

**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 at 10:47am*

**trig**

Simplify: csc^2 x sec x / sec^2 x + csc^2 x
*Tuesday, July 16, 2013 at 12:36pm*

**college trig**

find the radius of a pulley if rotating the pulley 108.03 degrees raises the pulley 37.3mm
*Monday, July 15, 2013 at 1:34pm*

**trig**

simplify the expression. tan(π/2-x)tanx
*Sunday, July 14, 2013 at 8:48pm*

**trig**

simplify the expression. cos^2x+sin^2x/cot^2x-csc^2x
*Sunday, July 14, 2013 at 6:22pm*

**trig**

simplify the expression. (sin^2x+cos^2x) - (csc^2x-cot^2x)
*Sunday, July 14, 2013 at 10:57am*

**trig**

simplify the expression. cot^2(x)-csc^2(-x)
*Sunday, July 14, 2013 at 10:37am*

**trig**

simplify the expression. -sin^2x-cos^2x
*Saturday, July 13, 2013 at 6:04pm*

**trig**

use basic identities to simplify the expression. csc θ cot θ / sec θ
*Saturday, July 13, 2013 at 12:49pm*

**(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 at 6:38am*

**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 at 9:23am*

**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 at 9:21am*

**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 at 10:32am*

**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 at 10:30am*

**trig**

Find all solutions in the interval [0,2pi]. sin 2x + sin x = 0
*Thursday, July 4, 2013 at 4:14pm*

**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 at 4:12pm*

**Trig**

Multiply and Simplify. ( 1 + cot θ )^2
*Thursday, July 4, 2013 at 12:50am*

**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 at 8:22pm*

**trig, math**

Given triangle ABC with a = 16, b = 14, and β = 54°, find the value of c.
*Wednesday, July 3, 2013 at 11:09am*

**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 at 11:06am*

**Trig**

Determine the number of triangles with the given parts. b=24 c=29 B=40deg I got 1
*Tuesday, July 2, 2013 at 11:45am*

**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 at 10:29am*

**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 at 1:34pm*

**trig**

Write the complex number in trigonometric form, using degree measure for the argument. -12 - 16i
*Friday, June 28, 2013 at 9:36pm*

**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 at 9:16pm*

**trig**

Solve the equation. Express your answer in trigonometric form. x^5 - 11 = 0
*Friday, June 28, 2013 at 12:39pm*

**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*

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