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October 23, 2014

October 23, 2014

**Recent Homework Questions About Trigonometry**

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**Trig**

A 7.25 inch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
*Sunday, April 1, 2012 at 6:20pm*

**Trig**

A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.
*Sunday, April 1, 2012 at 6:19pm*

**Trig.**

Josh kicks a soccer ball with an initial velocity of 18 feet per second out of a window from a height of 12 feet. The function h(t)= -16t^2+18t+12 represents the height of the soccer ball after t seconds.What is the domain of this function in the context of this problem?
*Sunday, April 1, 2012 at 2:17pm*

**Trig**

Why does 11.4(7pi/18)=133pi/30 ?
*Sunday, April 1, 2012 at 12:12pm*

**Trig **

Solve the equation 2sin(2x) = cos x. and Solve the equation cos^2(2x)–sin^2(2x)= (√3 / 2).
*Sunday, April 1, 2012 at 1:13am*

**Trig**

Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)
*Sunday, April 1, 2012 at 1:09am*

**Trig Circular Motion**

A es004-1.jpginch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
*Saturday, March 31, 2012 at 4:45pm*

**Trig**

A ferris wheel at the fair has a radius of 60 feet. If it takes 24 seconds to make a full revolution, what is the linear speed for the passengers?
*Saturday, March 31, 2012 at 4:44pm*

**trig**

2sin^2x-1=0[0,2pi)
*Thursday, March 29, 2012 at 10:59am*

**Geom./Trig.**

an airplane flies directly overhead at 540mph. 1 minute later is seen at an angle of elevation of 34 degrees. how far did the airplane fly during that time? what is the elevation of the plane?
*Wednesday, March 28, 2012 at 5:20pm*

**TRIG**

IF Y=5+7C0S 4(0-7). FIND YWHEN 0=42 DEGREES. SMALLEST POSITIVE VALUE OF 0 FOR WHICH Y=1.5
*Wednesday, March 28, 2012 at 11:58am*

**trig**

Two tracking stations are on the equator 134 miles apart. A weather balloon is located on a bearing of N 38°E from the western station and on a bearing of N 19°E from the eastern station. How far is the balloon from the western station? Round to the nearest mile.
*Wednesday, March 28, 2012 at 11:26am*

**trig**

Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)
*Wednesday, March 28, 2012 at 9:49am*

**trig**

prove: cot^2(x)=cos(x)/(sinx)(tanx)
*Monday, March 26, 2012 at 9:26pm*

**algebra-trig help asap**

An isosceles triangle has a base 22 cm long and a base angle of 72 degrees. Find its perimeter.
*Monday, March 26, 2012 at 7:50pm*

**trig**

prove: (tan x + sec x)^2 = 2sec^2 x + 2tan x sec x - 1
*Monday, March 26, 2012 at 11:20am*

**trig**

prove: (tan x + sec x)^2 = 2sec^2 x + 2tan x sec x - 1
*Monday, March 26, 2012 at 11:10am*

**trig**

How do I prove : 4sinAcosAcos2Asin15 all over. :sin2A(tan225-2sinsquared A)is equal to. :root 6 - root 2 over 2
*Monday, March 26, 2012 at 7:44am*

**trig**

Prove: sin(x–y)sin(x+y)=sin^2(x)–sin^2(y)
*Monday, March 26, 2012 at 1:09am*

**calculus**

need help simplifying some trig identities such as: (csc t) (sin t) cos t = 0.75 and tan t = 0.88, find sec t and cot t; (cot2t) (sin2t) + sin2 t; csc2t - cot2t/sin2t
*Sunday, March 25, 2012 at 9:15pm*

**trig**

Prove: (tan x+sec x)^2 = 2sec^2(x)+2tan(x)secx-1
*Saturday, March 24, 2012 at 5:10pm*

**trig**

Prove (cscx+cotx)(cscx-cotx)=1
*Saturday, March 24, 2012 at 4:10pm*

**Trig**

Prove: (cotx sinx)(secx-cosx)=sin^2(X)
*Saturday, March 24, 2012 at 3:03pm*

**trig**

What is cosx=1/2?
*Thursday, March 22, 2012 at 3:43pm*

**Trig **

As you ride a ferris wheel, your distance from the ground varies sinusoidally with time. When the last passenger boards the ferris wheel and the ride starts moving, let your position be modeled by the diagram provided. Let t be the number of seconds that have elapsed since ...
*Thursday, March 22, 2012 at 12:43pm*

**trig**

Solve for theta, giving a general formula for all of the solution: tan(theta)=-1 sin(theta/2)=1/2
*Thursday, March 22, 2012 at 12:28pm*

**Trig**

4sin^(2)x-3=0
*Wednesday, March 21, 2012 at 9:08pm*

**Trig **

cos(3x)=-1
*Wednesday, March 21, 2012 at 9:02pm*

**Trig**

Solve Sinx=Cos2x-1 for all values between 0 and 2pi
*Wednesday, March 21, 2012 at 4:34pm*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help
*Wednesday, March 21, 2012 at 12:57am*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help
*Wednesday, March 21, 2012 at 12:57am*

**trig**

If theta is a standard position angle and cot theta = 1.85, in which quadrant(s) could theta lie?
*Tuesday, March 20, 2012 at 3:50pm*

**trig**

if tan(θ)=√(33) / 4 (√ does not ride over 4) find sin(θ)<0 i would just like to know the steps of how to do it.
*Tuesday, March 20, 2012 at 3:33pm*

**trig**

What would be the force required to push a 100-pound object along a ramp that is inclined 10 degrees with the horizontal?
*Monday, March 19, 2012 at 7:08pm*

**trig**

if sin theta equals 3/7, what is tan theta?
*Monday, March 19, 2012 at 4:12pm*

**trig**

howard and keight who are 2km apart are on a horizontal plane observe a balloon in the same vertical plane with themselves the angles of elevation are 50 degrees and 65 degrees respectively find the height of the balloon. A.if its situated between howard and keight B.If it is ...
*Monday, March 19, 2012 at 7:03am*

**trig**

verify that 2/1+cos theta - tan squared (theta/2) = 1
*Monday, March 19, 2012 at 12:09am*

**trig e-maths**

giving that cosx=4/5 and siny=12/13, find cos(x+y) when x is acute and y is obtuse angle
*Sunday, March 18, 2012 at 9:58am*

**trig**

a plane takes off at 10.00am from an airfield, and flies at 120km/h on a bearing of N35W. A second plane takes off at 10.05am from the same airfield, and flies on a bearing of S80E at a speed of 90km/h. How far apart are the planes at 10.25am?
*Sunday, March 18, 2012 at 7:29am*

**trig**

Find the general solution for x if cos2x + sin3x = sinx
*Sunday, March 18, 2012 at 5:22am*

**inverse trig HELP PLEASE!!**

Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k How do I find the right answer? I am like seriously stuck. I need help please.
*Sunday, March 18, 2012 at 12:12am*

**trig**

In a computer simulation, a satellite orbits around Earth at a distance from the Earth's surface of 2.1 X 104 miles. The orbit is circular, and one revolution around Earth takes 10.5 days. Assuming the radius of the Earth is 3960 miles, find the linear speed (velocity) of ...
*Saturday, March 17, 2012 at 10:59pm*

**trig**

solve for theta 6. tan theta=-1 7. sin(theta/2)=1/2 thank you for your help!
*Saturday, March 17, 2012 at 6:00pm*

**trig**

when sin theta+cos theta=square root of 2,find the solution of sin^3 theta+cos^3 theta
*Saturday, March 17, 2012 at 3:51pm*

**Algebra-Trig help asap**

A rhombus has sides of 5 cm each and one diagonal is 6 cm long. Find the area of the rhombus.
*Tuesday, March 13, 2012 at 5:37pm*

**Math:Trig.!!!! **

You (safely) bungee jump from a 200-feet tall bridge in your town. Your distance above the water's surface depends on the time since you jumped. Sketch a reasonable graph.
*Monday, March 12, 2012 at 10:02pm*

**trig**

solve the equation 2 tan C-3=3 tan X-4 algebraically for all values of C in the interval odegrees lessthan or equal C lessthan360 degrees.
*Monday, March 12, 2012 at 9:20pm*

**Trig-Algebra help asap**

A regular octagon is inscribed in a circle with a radius of 5 cm. Find the area of the octagon.
*Monday, March 12, 2012 at 8:50pm*

**Trig-Algebra help asap**

A regular pentagon is inscribed in a circle whose radius measures 7 cm. Find the area of the pentagon.
*Monday, March 12, 2012 at 8:49pm*

**Trig-Algebra help asap**

A rhombus has sides of 5 cm and one diagonal is 6 cm long. Find the area of the rhombus.
*Monday, March 12, 2012 at 8:17pm*

**Trig-Algebra help asap**

The adjacent sides of a parallelogram measure 8 cm and 12 cm and one angle measures 60 degrees. Find the area of the parellelogram.
*Monday, March 12, 2012 at 7:50pm*

**trig**

SOlve over (2,pie) and find the general solution in radians. 2sin3x = square root of 2
*Monday, March 12, 2012 at 7:32pm*

**trig**

5sin(2x)+4cos(x)=0
*Monday, March 12, 2012 at 6:04pm*

**trig**

5sin(2x)+4cos(x)+0
*Monday, March 12, 2012 at 6:03pm*

**trig**

cos x/1+sin x + 1+sin x/ cos x= 2sec x
*Monday, March 12, 2012 at 5:09pm*

**trig**

verify the identity algebraically- (5-5 cos x)(5+5 cos x)=25 (sin^x)
*Monday, March 12, 2012 at 5:07pm*

**Trig Help**

Prove the following: [1+sinx]/[1+cscx]=tanx/secx =[1+sinx]/[1+1/sinx] =[1+sinx]/[(sinx+1)/sinx] =[1+sinx]*[sinx/(sinx+1)] =[sinx+sin^2x]/[sinx+1] =[sinx+(1-cos^2x)]/[sinx+1] =??? This is where I'm stuck. Can someone help me. Please check what I got is right so far it's...
*Sunday, March 11, 2012 at 11:42pm*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?
*Sunday, March 11, 2012 at 7:09pm*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?
*Sunday, March 11, 2012 at 7:09pm*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?
*Sunday, March 11, 2012 at 7:07pm*

**trig**

If sec theta = radical 5, what is the exact value of cos theta
*Sunday, March 11, 2012 at 12:33pm*

**trig**

If sec theta = radical 5, what is the exact value of cos theta
*Sunday, March 11, 2012 at 12:32pm*

**trig**

A ship sails 40 miles SOUTH and 15 miles EAST. Find the bearing from where it began? HELP.
*Sunday, March 11, 2012 at 12:20pm*

**trig or geom**

i have to use pythagorean theorem to find the leg-measure of x. in the formula, x would be a^2. the hypotenuse is 11 and "b" is unknown. there is also a cosine with a measure of .4 at the top-most angle.. what is x? i don't know how to use cosine with the problem
*Sunday, March 11, 2012 at 10:38am*

**Trig.**

finnd a possible measure of the angle drawn in standard position that passes through the points (ã2,-ã2)
*Sunday, March 11, 2012 at 9:59am*

**calculus**

find max, min and saddle points of the give function f(x,y)=sin(x)+sin(y)+sin(x+y) 0<=x<=pi/4 0<=y<=pi/4 i have that dz/dx=cos(x)+cos(x+y) dz/dy=cos(y)+cos(x+y) and i set them equal to zero but im kinda confused on how to really solve that. i mean i got an answer ...
*Friday, March 9, 2012 at 9:30pm*

**Geometry/trig**

A ladder, 17 feet long, leans against a wall at a 49 degree angle to the ground. How far up the wall does the ladder reach?
*Friday, March 9, 2012 at 5:38pm*

**trig**

Find all angles in degrees that satisfy the equationtan∝ +√3=0
*Friday, March 9, 2012 at 4:50pm*

**Trig**

If CSC X = 4 in the quadrant 1, what is COS X?
*Friday, March 9, 2012 at 4:06pm*

**Alg 2 trig**

Write a sine equation for period= pie, amplitude=1/2, vertical shift up 1 and phase shift left pie/4. How would the equation be written?
*Friday, March 9, 2012 at 11:05am*

**trig**

what is the exact value of cos(x+y) if tan=x sqare root 3 over 3 and sin y=square root 2 over 2?
*Thursday, March 8, 2012 at 10:59pm*

**Trig**

How do you do this? 1-sin^2x/csc^2 x-1
*Thursday, March 8, 2012 at 1:52pm*

**Trig**

HELP!!!! I dont know how to do the trig identity with this problem csc^4 x-cot^4x= Csx^2 x + cot^2x
*Thursday, March 8, 2012 at 9:04am*

**trig**

Simplify the expression cos^2 x (sec^2 x-1)
*Thursday, March 8, 2012 at 8:32am*

**Trig Proofs! **

I'm having trouble solving this proof. Can you help? cos^3+sin^3/cosx+sinx = 1-sinxcosx Thanks!:)
*Thursday, March 8, 2012 at 12:50am*

**trig**

solve each equation for è, giving a general formula for all of the solutions: 6. tanè=-1 7. sin(è/2)=1/2 Please show step by step on how to solve these. Im not sure on how to do them. Thank you for your help!
*Wednesday, March 7, 2012 at 7:21pm*

**trig.**

A ladder 20 feet long leans against the side of a house. Find the height from the top of the ladder to the ground if the angle if the angle of elevation of the ladder is 80°
*Wednesday, March 7, 2012 at 6:20pm*

**trig.**

A ladder 20 feet long leans against the side of a house. Find the height from the top of the ladder to the ground if the angle if the angle of elevation of the ladder is 80°
*Wednesday, March 7, 2012 at 6:19pm*

**trig**

if sin a=4/5 and is quadrant 2 and sin b= 8/17 and is in quadrant 1, find cos (a-b)
*Wednesday, March 7, 2012 at 6:19pm*

**trig**

16. Let W(ƒá ) be a point in Quadrant I on the unit circle with center O. W(ƒá )B is perpendicular to the x-axis at B, OB = 0.6. and W(ƒá )B ƒ 0.8. Find:
*Tuesday, March 6, 2012 at 11:33pm*

**Pre-Cal**

given the function y=2sin3x-1, identify the following below. also show its graph for the primary cycle. (identifying parts of a trig. equation) asymptotes= k= c= axis= primary cycle= period=
*Tuesday, March 6, 2012 at 1:18pm*

**ALG/TRIG**

I cannot seem to get the right answer. Animal Pulse Rate According to one model, an animal’s heart rate varies according to its weight. The formula N(w)=885w^-1/2 gives an estimate for the average number N of beats per minute for an animal that weighs w pounds. Use the ...
*Tuesday, March 6, 2012 at 6:21am*

**ALG/TRIG**

Lost is an understatement..please help me understand this. Orbits and Distance Johannes Kepler (1571–1630)discovered a relationship between a planet’s distance D from the sun and the time T it takes to orbit the sun. This formula is , where T is in Earth years and ...
*Tuesday, March 6, 2012 at 2:22am*

**Trig**

Please help. I can't get this problem at all. When two bubbles cling together in midair their common surface is part of a sphere whose center D lies on the line passing through the centers of the bubble. Also, angles ACB and ACD are 60 degrees. Show that the radius r of ...
*Monday, March 5, 2012 at 10:13pm*

**Trig**

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α
*Monday, March 5, 2012 at 8:23pm*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*Monday, March 5, 2012 at 8:23pm*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect
*Monday, March 5, 2012 at 8:22pm*

**Trig**

Prove (3cosθ-4sinθ)^2+(4cosθ+3sinθ)^2=25
*Monday, March 5, 2012 at 8:02pm*

**Trig**

Prove sin(α+β)sin(α-β)=cos^2β-cos^2α
*Monday, March 5, 2012 at 8:01pm*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*Monday, March 5, 2012 at 8:01pm*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect
*Monday, March 5, 2012 at 8:00pm*

**trig**

Q1: Prove cos^2t+4cost+4/cost+2=2sect+1/sect Q2: A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*Monday, March 5, 2012 at 7:51pm*

**Trig**

Prove cos^2t+4cost+4/cost+2=2sect+1/sect
*Monday, March 5, 2012 at 7:40pm*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*Monday, March 5, 2012 at 7:38pm*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α
*Monday, March 5, 2012 at 7:37pm*

**geom/trig**

A 40 ft ladder leans against a wall so the base of the ladder is 11 feet away from the base of the wall . What angle does the ladder make with the wall?
*Monday, March 5, 2012 at 7:31pm*

**Trig**

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?
*Monday, March 5, 2012 at 7:18pm*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α please help... this is the only one I didn't understand out of all my homework...
*Monday, March 5, 2012 at 7:12pm*

**Trig**

prove sin(α+β)sin(α-β)=cos^2β-cos^2α
*Monday, March 5, 2012 at 7:00pm*

**trig**

if sin 7x = cos x+10 find the value of x
*Monday, March 5, 2012 at 6:00pm*

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