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September 1, 2014

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

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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 18° 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

Math - Trig
From the foot of a building I have to look upwards at an angle of 22° 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° to look at the top of the tree. a. How tall is the tree? b...
Thursday, December 12, 2013 at 3:20am

Math: Trig
Help with vectors, please. Thanks 1) Express point in rectangular form. Give EXACT answer, if possible? (2, 4π /11) 2) Given P = (2. -3) and Q = (-3, -4). find the component form of vector PQ 3) The vector v has a magnitude of 25 inches and a direction of 32° , ...
Tuesday, December 10, 2013 at 12:25am

Trig
Sum and diffence formula Finding Exact value of Tan 105-Tan 10)-15)/1+ tan(105)Tan(-15)
Monday, December 9, 2013 at 8:59pm

trig
prove that: sinC+sinD =2sin((C+D)/2)*cos((C-D)/2)
Sunday, December 8, 2013 at 9:49pm

trig
Points X, Y, and Z are on the circumference of a circle with radius 2 such that <YXZ = 45 degrees and <XZY = 60 degrees. Find the area of triangle XYZ.
Saturday, December 7, 2013 at 9:08pm

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(&#​952;), 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

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