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August 20, 2014

August 20, 2014

**Recent Homework Questions About Trigonometry**

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**trig**

An airplane has an airspeed of 450 km/hr bearing N45E. The wind velocity is 30 km/hr in the direction N30W. What is the ground speed and what is its direction?. I have gotten this far: A= 450cos(45), 450sin(45) = (318.20, 318.20) W= 30cos(120), 30sin(120) = (-15, 25.98) A+W= ...
*Wednesday, July 13, 2011 at 1:25pm*

**trig**

Verify that each trigonometric equation is an identity tan^2+1/sec Î± =sec Î±
*Wednesday, July 13, 2011 at 8:15am*

**trig**

During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the water is at average ...
*Wednesday, July 13, 2011 at 12:18am*

**trig question...**

During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the water is at average ...
*Tuesday, July 12, 2011 at 1:41pm*

**Math-trig.**

1)sinx+cosx=1 2)sinx+cosx=1+sin2x
*Friday, July 8, 2011 at 6:57am*

**trig**

find cos (x/2) when sint =12/13
*Thursday, July 7, 2011 at 11:11pm*

**trig**

1=2pi times the square root of (L/9.8)
*Wednesday, July 6, 2011 at 11:21pm*

**trig**

sin^2(3 theta+5pie)+cos^2(3 theta+5pie)= ?
*Wednesday, July 6, 2011 at 5:22pm*

**trig**

N 5 22x2 1 76x 1 430 Use the equation to find N for each year in the table. (b) Discuss how well this equation approximates the data. (c) Rewrite the equation with the right side completely factored. (d) Use your equation from part (c) to find N for each year in the table. Do ...
*Friday, July 1, 2011 at 9:15pm*

**trig**

An airplane flying at 600 miles per hour has a bearing of 152 degrees. After flying for 1.5 hours, how far north and how far east will the plane have traveled from point of departure?
*Thursday, June 30, 2011 at 9:09pm*

**trig**

Evaluate the expression cos 22 degrees and sec 22 degrees
*Thursday, June 30, 2011 at 11:25am*

**trig **

A 115 foot foot casts a 147 foot shadow, what is the degree of elevation to the sun
*Tuesday, June 28, 2011 at 10:23pm*

**trig**

y=7sin20degrees/5
*Monday, June 27, 2011 at 11:15pm*

**Trig**

A plane is flying at 240 mph heading North 60 degrees East. The wind is blowing at South 30 degrees East at 30 mph. What is the largest and smallest angles?
*Saturday, June 25, 2011 at 2:59pm*

**trig**

sinx+sinxcot^2x=cscx prove each identity
*Friday, June 24, 2011 at 11:02am*

**trig**

tan(theta)-1= sin^2(theta)-cos^2(theta)/ sin(theta)cos(theta)+cos^2(theta) prove each identity
*Friday, June 24, 2011 at 11:01am*

**Algebra/Trig**

The members of a men’s club have a choice of wearing black or red vests to their club meetings. A study done over a period of many years determined that the percentage of black vests worn is 60%. If there are 10 men at a club meeting on a given night, what is the ...
*Monday, June 20, 2011 at 6:18pm*

**trig**

the angle in one regular polygon is to that in another as 3:2 and the number of the sides in first is twice that in second determine the the number of sides of 2 polygons
*Sunday, June 19, 2011 at 3:10am*

**Trig**

The graph of y = 7cosx + 24sinx would be a sinusoid if it were plotted. What would be the first positive value of x at which there is a high point?
*Friday, June 17, 2011 at 1:15pm*

**trig**

1. if sin 2A = Psin2B, prove that tan(A+B)/tan(A-B)=P+1/P-1.
*Tuesday, June 14, 2011 at 5:17am*

**trig**

Why are the quadrants situated and numbered the way they are.What is the purpose.
*Monday, June 13, 2011 at 8:08pm*

**trig**

how high is a tree that casts a 30 ft shadow at the same time a 10 ft pole casts a shadow which is 10 ft long?
*Sunday, June 12, 2011 at 10:53pm*

**Trig**

Find the amplitude, period, and phase shift of the following function: y=-2cos2(θ+45)
*Saturday, June 11, 2011 at 3:58pm*

**Trig**

URGENT, Please answer this question: give the value of: Tan(Arctan x+1/x-1+Arctan x-1/x)
*Saturday, June 11, 2011 at 10:21am*

**trig**

if alpha and beta are 2 different values of θ lying between 0 and 2π which satisfy the equation 6cosθ+8 sinθ=9 find the value of sin alpha + beta
*Saturday, June 11, 2011 at 6:54am*

**TRIG..............**

Q.1 Prove the following identities:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx (ii) (1+cotx+tanx)(sinx-cosx)/sec^3x-cosec^3x = sin^2xcos^2x.
*Friday, June 10, 2011 at 7:18am*

**Trig**

give the value of tan(arctan x+1/x-1+arctanx-1/x)
*Thursday, June 9, 2011 at 9:58pm*

**aleg/trig**

two forces of 14and 30 act on a body forming an obtuse angle w/ eachother. if the resultant is 60, whats the angle betweeen the 2 forces?
*Thursday, June 9, 2011 at 9:15pm*

**alegbra/trig**

x^2+2x-15=0 solve by completing the square
*Thursday, June 9, 2011 at 9:13pm*

**Math - Trig**

Let Vector V(t) = 2pi t î + 2pi t ĵ. Find the vector V(1/3). Where is the vector after the next 1/3s? What is the angular speed?
*Thursday, June 9, 2011 at 2:33am*

**algebra/trig**

1.Find the domain f(x)=ã(x^(2)-9) 2. Find all six trig functions for (-3,4)
*Wednesday, June 8, 2011 at 11:27pm*

**trig**

I get that we have to put it into radical form, but I don't understand the process. Can someone walk me through it and explain it? arccos(-1/2)
*Tuesday, June 7, 2011 at 4:26pm*

**trig**

FInd the exact value pf the 6 trig function of alpha Given: point (-2,-6) on the terminal side of the angle in standard position sin alpha cos alpha tan alpha sec alpha csc alpha cot alpha
*Tuesday, June 7, 2011 at 10:26am*

**Trig**

Evaluate (if possible) the sine,cosine, and tangent of the angle 10pi/3
*Monday, June 6, 2011 at 4:58pm*

**Trig**

Find (if possible) the trig function of the quadrant angle. sec 3pi/2
*Monday, June 6, 2011 at 4:00pm*

**Trig**

Find (if possible) the trig function of the quadrant angle.
*Monday, June 6, 2011 at 3:59pm*

**algrebra 2 / trig**

solve the triangle a=1 b=2 C=50 degrees
*Monday, June 6, 2011 at 3:46pm*

**trig**

How can I get rid of the square roots in this fraction? sqrt((2-sqrt3))/sqrt((2+sqrt3)) the answer is 2-sqrt3 but I don't know how they arrive at it.
*Sunday, June 5, 2011 at 9:39pm*

**trig**

please help. show step by step how to solve h(x)=2 cot(x/2) Identify period identify x-intercepts identify asymptotes
*Sunday, June 5, 2011 at 9:04pm*

**trig**

on the same set of axes: (0 degrees is greater than or equal to x and x is less than or equal to 360 degrees) (a) sketch the graphs of y= sin degrees ,y=2sinx degrees and y=sin2x degrees
*Saturday, June 4, 2011 at 10:45pm*

**trig**

Given Tangent theta = -5 on 4 and cos theta >0, find sine theta and sec theta
*Saturday, June 4, 2011 at 10:39pm*

**Trig**

Find all solutions of the equation on the interval [0,2pi): Tan^2x=1-secx
*Thursday, June 2, 2011 at 9:41pm*

**Trig**

Find all solutions of equation on interval [0,2pi] 1=cot^2x + cscx
*Thursday, June 2, 2011 at 7:58pm*

**trig**

1-cosA+cosB-cos(A+B)/1+cosA-cosB-cos(A+B)=tan(A/2)ct(A/2)
*Thursday, June 2, 2011 at 12:23am*

**trig**

2cos^2+sin=1
*Wednesday, June 1, 2011 at 6:47pm*

**Algebra 2/ trig**

sin theta= 7/25, 0< theta < pi/2 cos beta=8/17, 0, beta, pi/2 Find(theta+ beta)
*Wednesday, June 1, 2011 at 6:28pm*

**trig**

find an angle between 0 and & 2 pi that is coterminal with - 11 over 24 pi
*Tuesday, May 31, 2011 at 11:32pm*

**Trig**

How do I prove the following Identity? sec x(sec x-cos x)=tan^2x If there is a certain website or suggestion to help with these type of equations I would greatly appreciate it. I've been studying these for a while but still get pretty confused.
*Tuesday, May 31, 2011 at 9:20pm*

**trig**

Simplify: cos x cos x ----- + ----- sec x-1 sec x+1
*Tuesday, May 31, 2011 at 8:01pm*

**trig**

verifying a solution. 4cos^2 2x-2=0
*Tuesday, May 31, 2011 at 7:43pm*

**trig**

how much force is necessary to stop a 2500 pound car from rolling down a 40degree slope
*Monday, May 30, 2011 at 9:17pm*

**trig**

If cos(t)=(-7/8) where pi<t<(3pi/2), find the values of the following trig functions. cos(2t)=? sin(2t)=? cos(t/2)=? sin(t/2)=?
*Monday, May 30, 2011 at 8:33pm*

**trig**

prove as an identity 1/1+sin(x) + 1/1-sin(x)
*Monday, May 30, 2011 at 8:33pm*

**trig**

Ok, so im brand new at trigonometry. If i have a right triangle with an acute angle of 30° an opposite side of 4 and a hypotenuse of x how do ii find x
*Monday, May 30, 2011 at 7:55pm*

**trig**

y = sin (3x-2pi)
*Monday, May 30, 2011 at 3:18pm*

**trig**

sec(90degrees -theta)
*Friday, May 27, 2011 at 10:14pm*

**trig**

find the exact zeros of the function in the interval [0, 2π) 2 cot squared x + 3 csc x=0
*Friday, May 27, 2011 at 3:37pm*

**pre cal\trig**

Find the following cot(Arccsc 25/24) show your work
*Thursday, May 26, 2011 at 5:17pm*

**trig**

A plane is flying 225 mph heading South 25°West. The wind is blowing South 80°East at 60 mph. What is the bearing of the plane? What is the smallest angle of the triangle? What is the largest angle of the triangle? What is the remaining angle of the triangle? What is ...
*Thursday, May 26, 2011 at 10:28am*

**trig**

if x and y are positive acute angles, tan x=1/3and tan y =1/4, find the value of sin(x-y)
*Wednesday, May 25, 2011 at 12:22pm*

**trig**

A 2000 pound car is parked on a street that makes an angle of 12* with the horizontal (think it's a street on a hill). a) find the magnitude of the force required to keep the car from rolling down the hill. b) Find the force perpendicular to the street.
*Wednesday, May 25, 2011 at 11:24am*

**trig**

An aifplane is flying on a compass heading (bearing) of 170* at 460 mph. A wind is blowing with the bearing 200* at 80mph. a) Find the component form of the velocity of the airplane. b) Find the actual ground speed and direction of the airplane.
*Wednesday, May 25, 2011 at 10:58am*

**trig**

A plane is is flying 240 mph heading N60°E. The wind is blowing S30°E at 30 mph. What is ground speed? What is the smallest angle in the triangle? What is the biggest angle in the triangle? What is the remaining angle in the triangle? What is the bearing of the plane?
*Wednesday, May 25, 2011 at 8:21am*

**trig**

Find the solutions to the equation cos2x=sinx and 2cos^2x-3cosx-3=0
*Tuesday, May 24, 2011 at 9:47pm*

**Trig**

How to find all solutions for 3tan^22x-1=0?
*Tuesday, May 24, 2011 at 5:35pm*

**Trig**

find cos x/2, sin x = 1/4, 360 < x < 450, use half-angle identity
*Monday, May 23, 2011 at 10:28pm*

**trig**

find the least positive value of @. sec (4@+10)cos(3@+17) @=theta
*Monday, May 23, 2011 at 9:43am*

**trig**

In Rights Triangle ABC with C=90 degrees if a=4 and c=2square roots of 7, find SinA
*Sunday, May 22, 2011 at 10:18pm*

**trig**

In Rights Triangle ABC with C=90 degrees if a=4 and c=2square roots of 7, find SinA
*Sunday, May 22, 2011 at 10:17pm*

**trig**

How do I name the quadrand in which angle thada may lie if sec thada > 0 and tan thada > 0?
*Sunday, May 22, 2011 at 5:37pm*

**Trig**

How do I find the quadrant in which angle thada may lie if cos thada > 0 and tan thada < 0?
*Sunday, May 22, 2011 at 5:35pm*

**Trig**

cos4x*cos3x + sin4x*sin3x
*Sunday, May 22, 2011 at 2:30pm*

**Trig**

A boat heads S 15 degrees E on a river that flows due west. the boat travels S 11 degrees W with a speed of 25 km per hour. Find the speed of the current and the speed of the still water. This is due tomorrow.
*Sunday, May 22, 2011 at 1:05am*

**trig**

In triangle XYZ, angle X = 90°, angle Y = 38°, and z = 4'5". Find y
*Friday, May 20, 2011 at 12:42pm*

**Trig**

A tree is growing at an angle out of the ground, 15°17' from vertical. Standing 10 feet away from the base, the angle to the top of the tree is 25°17'. What is the length of the tree?
*Friday, May 20, 2011 at 10:51am*

**trig**

if A+B=45 degree show that (cos A-1)(cotB-1)=2.
*Thursday, May 19, 2011 at 2:31pm*

**trig**

Find the angle between 0 and 2pi that is coterminal with negative one half pi; expressing the answer in radians in terms of pi.
*Thursday, May 19, 2011 at 1:37pm*

**Trig/Pre-Calc**

The demand equation for a microwave oven is given by: p=500-0.5(e^0.004x) Find the demand x for a price of (a) p=$600 and (b) p=$300 Any help would be greatly appreciated.
*Tuesday, May 17, 2011 at 10:57pm*

**trig**

csc^2x secx/sec^2x+csc^2x
*Tuesday, May 17, 2011 at 9:02pm*

**Trig/Pre-Calc**

$2500 is invested in an account at interest rate r, compounded continuously. Find the time required for the amount to (a) double and (b) triple. r=0.085 I know you use the formula A=Pe^rt and you would start by setting it up as follows: A=(2500)e^(0.085)(t) I'm not sure ...
*Tuesday, May 17, 2011 at 8:15pm*

**trig**

Use a graph of the cosecant function to find the value of theta for which csc theta equals 1.
*Tuesday, May 17, 2011 at 9:20am*

**Trig/Pre-Calc**

Could someone please help me on this problem. I'm really confused, and this assignment is due tomorrow. Solve the logarithmic equation algebraically. Approximate the result to three decimal places. log4x-log4(x-1)=1/2 To start off the equation, I know you would do the ...
*Monday, May 16, 2011 at 7:01pm*

**Trig/Pre-Calc**

Need help with current Trig problem for tomorrow: Solve the logarithmic equation algebraically. Approximate the result to three decimal places. 6log3(0.5x)=11 I know to start off the equation you divide by 6. I know the answer is 14.988. I just am puzzled on how to receive the...
*Monday, May 16, 2011 at 6:18pm*

**trig**

How do you solve csc2x + 1 = 0
*Monday, May 16, 2011 at 5:12pm*

**trig**

Find the exact value of Cos(sin-1ã(3/2))
*Monday, May 16, 2011 at 10:31am*

**trig**

Given that sin (pi/10)=(sqrt(5)-1)/4, use double-angle formulas to find an exact expression for sin(pi/5).
*Monday, May 16, 2011 at 1:56am*

**trig**

what are the values of theta in the interval 0 degrees is lessthan or equal to theta is less than or equal to 360 degrees that satisfy the equation tan theta minus square root of 3 equals 0?
*Sunday, May 15, 2011 at 11:02pm*

**Trig Identities..**

Solve any way possibly? Thank you! 1-sin^2x/1-cosx
*Sunday, May 15, 2011 at 10:55pm*

**Trig**

A ramp 38' long rises to a platform. The bottom of the platform is 20' from the foot of the ramp. Find x , the angle of elevation of the ramp. Round your answer to the nearest hundredth of a degree. After this question I'm done with TRIG!!! Thanks
*Sunday, May 15, 2011 at 8:11pm*

**Trig**

Consider a triangle ABC like the one below. Suppose that A=45 degress, B=34 degress, and a= 70. Solve the triangle. Round your answers to the nearest tenth.
*Sunday, May 15, 2011 at 8:02pm*

**trig**

Assume that we know sin(18 degrees)=(sqrt(5)-1)/4, cos(18 degrees)=(sqrt(sqrt(5)+5))/8, find sin(42 degrees) exactly, without using a calculator. Also find cos(42 degrees).
*Sunday, May 15, 2011 at 7:16pm*

**trig**

Evaluate sin(29 degrees)cos(31 degrees) + cos(29 degrees)sin(31 degrees) exactly, without using a calculator.
*Sunday, May 15, 2011 at 7:05pm*

**Trig**

Trig Identity. 1-sin^2x/1-cosx
*Sunday, May 15, 2011 at 5:56pm*

**Trig**

Find all solutions of the equation in the interval [0,2pi). sqrt(3)cottheta-1= 0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.
*Sunday, May 15, 2011 at 3:08pm*

**Algebra 2 / Trig**

Given cos X = -0.147, find two possible values for X that are not co-terminal.
*Sunday, May 15, 2011 at 2:44pm*

**trig**

How do I prove these trig identities? secx-cosx/tanx =sinx And 1+sinx/cosx+ cox/ 1+sinx=2secx
*Sunday, May 15, 2011 at 2:10pm*

**Trig**

Find all solutions of the equation in the interval [0,2pi) . cos(theta)=0.7125 If there is more than one solution, separate them with commas. Do not round any intermediate computations, and round your answer(s) to the nearest hundredth. Can someone help me with this? Thanks
*Sunday, May 15, 2011 at 1:33pm*

**Trig**

Rewrite cos(tan^-1(v)) as an algebraic expression in v. Can someone help me with this problem? Thanks
*Sunday, May 15, 2011 at 7:36am*

**Trig**

The polynomial function f(x) is defined by f(x)=-4x^4+9x^3+2x^2-7x-2. Use a graphing calculator to find all the points where there is a local minimum. Round to the nearest hundredth.
*Sunday, May 15, 2011 at 12:10am*

**Trig**

I need help, I don't remember what to do. Find all solutions of the equation in the interval [0,2pi]. (2cosè+sqrt3)(cscè+1)=0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.
*Saturday, May 14, 2011 at 7:18pm*

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