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December 18, 2014

December 18, 2014

**Recent Homework Questions About Trigonometry**

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**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*

**Trig- Check my answer Please**

Find the unit vector in the direction of <-1,-2>. Do not approximate any numbers in your answer. I get (-1/sqrt10) and (-3/sqrt10)
*Saturday, May 14, 2011 at 5:23pm*

**trig**

if point P is a point on the terminal side of 0, and 0 is in standard position, find sin 0,cos 0 and tan 0. 1. P(-6,8) 2. P (1,3) 3. P (-2,-40), 4. P (-5, -12)
*Saturday, May 14, 2011 at 1:00pm*

**trig**

If cos 0 = - 1/2 and tan 0 > 0, find the quadrant that contains the terminal side of 0, and then find the exact values of the other five trig functions of 0.
*Saturday, May 14, 2011 at 11:40am*

**trig**

if sin 0 > 0 and tan 0 < 0, what quadrant contains the terminal side of 0.
*Saturday, May 14, 2011 at 11:33am*

**Trig- Check my answer Please**

Find the reference angle for -144 degrees. I'm coming up with 504 degrees, but I think I'm missing a step.
*Saturday, May 14, 2011 at 8:21am*

**Trig**

I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-sqrt(4-x^(2)) 2. 34x^(2)+12y^(2)=18
*Friday, May 13, 2011 at 8:01pm*

**trig**

simplify (sec^2x + csc^2x) - (tan^x +cot^2x) to either a constant or a basic trigonometric function.
*Friday, May 13, 2011 at 8:44am*

**Trig**

I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-ã(4-x^(2)) 2. 34x^(2)+12y^(2)=18
*Friday, May 13, 2011 at 4:52am*

**Trig**

How can I find the exact value of Sin 480 degrees? Thanks
*Thursday, May 12, 2011 at 10:23pm*

**Trig**

Let (theta) be an angle in quadrant II such that sec(theta) -4/3 . Find the exact values of cot (theta) and sin (theta).
*Wednesday, May 11, 2011 at 9:15pm*

**trig**

Let be an angle in quadrant II such that sec(theta) -4/3 . Find the exact values of cot (theta) and sin (theta).
*Wednesday, May 11, 2011 at 9:08pm*

**trig**

how do you graph y=-(1/4)sin(3/4x+pi/8? include the amplitude, period, vertical translation, horizontal shift, and table of values please.
*Wednesday, May 11, 2011 at 8:10pm*

**Trig- Check my answer Please**

Use a cofunction to write an expression equal to csc(4ð/11). Is the answer csc(4ð/11)= 1/sin(4ð/11)
*Wednesday, May 11, 2011 at 7:31pm*

**Trig**

Use a cofunction to write an expression equal to csc(4ð/11). I need help solving this problem. Thank You
*Wednesday, May 11, 2011 at 4:53am*

**Trig**

Cos(2theta)=-1/2 There are 6 solutions, how do i solve this?
*Tuesday, May 10, 2011 at 10:32pm*

**trig**

Let (theta) be an angle in quadrant II such that csc(theta)=8/5 Find the exact value of tan(theta) and cos(theta).
*Tuesday, May 10, 2011 at 9:31pm*

**trig**

Let (theta) be an angle in quadrant II such that csc(theta)=8/5 Find the exact value of tan(theta) and cos(theta).
*Tuesday, May 10, 2011 at 9:30pm*

**trig**

How would you go about finding x and y?? [x-8 2 2y] [9x-16 2 6] [ 2 -7x 7] = [ 2 -7 7] [-4 y-4 2] [-4 -1 2]
*Tuesday, May 10, 2011 at 7:52pm*

**Trig**

How would you write the partial fraction decomposition of the rational expresion 1/(x^2)-25? I know that you factor the denominator, so that's 1/(x-5)(x+5). What are the next steps?
*Tuesday, May 10, 2011 at 7:45pm*

**Trig**

Find Theta in the degree measure for the indicated quadrant. Show the diagram. cot (Theta)= -(Radical 3/1)in quadrant IV. I got 240 degrees but i dont know how to do the diagram since 240 degrees is in quadrant III. How do you put this in a diagram?
*Tuesday, May 10, 2011 at 3:48pm*

**trig**

CosA x cos2A + ((sin2A)^2)/2cosA
*Tuesday, May 10, 2011 at 9:23am*

**trig question**

During a 12- hour period, the tides in one area of the Bay of Fundy causes the water level to rise to 6 m above the average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2m as measured against a pier. Suppose the water is at average ...
*Monday, May 9, 2011 at 9:26pm*

**Trig problem**

During a 12- hour period, the tides in one area of the Bay of Fundy causes the water level to rise to 6 m above the average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2m as measured against a pier. Suppose the water is at average ...
*Monday, May 9, 2011 at 6:41pm*

**trig**

find sin if cos(2è)=(4)/(5) and theta terminates in quadrant 1
*Monday, May 9, 2011 at 5:53pm*

**trig**

How do you solve cos(2arcsin 1/4) using inverse trig. functions??!! PLEASE HELP ME!
*Monday, May 9, 2011 at 11:20am*

**trig**

if sec theta=-5/4 and 180degree < theta< 270degree, find tan theta a.-3/5 b 4/5 c.3/4 d.3/5
*Sunday, May 8, 2011 at 5:35pm*

**trig **

1st-the reason i keep change my name because some of my friends are using my computer by their own name to asked questions. we are having a hard time solving each trig problems 2nd- if sin theta=0.6 and 90 degree <theta < 180 degree, find the exact value of sin 2 theta. ...
*Sunday, May 8, 2011 at 5:16pm*

**trig**

Determine the value of cos(theta) given that cos(pi − theta) = .2 (A)p.96 (B) .2 (C) −.2 (D) −sqrt.96 (E) None of the above.
*Sunday, May 8, 2011 at 4:09pm*

**trig**

What is the cotangent of 0 degree? (A) 0 (B) 1 (C) 1/2 (D) −1 (E) None of the above.
*Sunday, May 8, 2011 at 4:08pm*

**trig**

A right triangle has sides of length 5, 12 and 13. What is the sine of the angle opposite the hypotenuse? (A) 1 (B) 5/12 (C) 5/13 (D) 12/13 (E) None of the above.
*Sunday, May 8, 2011 at 4:06pm*

**trig**

If csc(x) =1/sqrt7 then sec(x) equals (A)p7/7 (B) 6/7 (C)p6/p7 (D)p7 (E) None of the above.
*Sunday, May 8, 2011 at 4:05pm*

**trig**

The tangent of an acute angle equals 1/2. What is the sine of the angle? (A) 1/p3 (B)p5/2 (C) 2/p5 (D) 1/p5 ( E) None of the above.
*Sunday, May 8, 2011 at 11:57am*

**trig**

In a right triangle the hypotenuse has length 10 and the the sum of the cotangents of all three angles of the triangle equals 2. What are the lengths of the other two sides of the triangle? (A) 5 and 5p3 (B) 5p2 and 5p2 (C) 1 and3 p11 (D) 4 and 2p21 (E) None of the above.
*Sunday, May 8, 2011 at 11:56am*

**trig**

How many solutions does the equation cos(x) + cos(−x) = 0 have if 0 < x < 2pi? (Radian measure is assumed for x.) (A) infinitely many (B) 1 (C) 2 (D) 3 (E) None of the above.
*Sunday, May 8, 2011 at 11:54am*

**trig**

A sine wave function f(x) = a sin(bx) has amplitude 10 and period 40. What are the values of a and b? (A) a = 10 and b = 20/pi ( B) a = 10 and b = 1/40 (C) a = 10 and b = pi/20 (D) a = 10 and b = 40 E) None of the above.
*Sunday, May 8, 2011 at 11:53am*

**trig**

use a half angle formula to find the exact value of cos 75 degree
*Sunday, May 8, 2011 at 9:56am*

**trig**

Find a numerical value of one trigonometric function of x if secxcotx=4 A.cscx=1/4 b.secx=4 c.secx=1/4 d.cscx=4
*Sunday, May 8, 2011 at 9:20am*

**trig**

Find the exact values of the other trig functions of theta given sec theta=7 and sin theta is less than 0.
*Sunday, May 8, 2011 at 12:35am*

**trig**

A triangle T has vertices P, Q and R. The length of the edge between P and Q is 10, and the angles at P and Q are 60degree and 45degree respectively. What is the area of T? (A) 50p3/(1 +p3) (B) 10p3/(1 +p3) (C) 50/(3 + 3p3) (D) 10/(3 + 3p3)(E) None of the above.
*Saturday, May 7, 2011 at 6:36pm*

**trig**

A triangle T has vertices P, Q and R. The length of the edge between P and Q is 10, and the angles at P and Q are 60degree and 45degree respectively. What is the radian measure of the angle at R? (A) 5pi/24 (B) 5/24 (C) 5pi/12 (D) 5/12 (E) None of the above.
*Saturday, May 7, 2011 at 6:34pm*

**trig**

Find the numerical value of cos(60degree) + cot(30degree): (A) 1/2 (B) 3p3/2 (C) 12 +p3 (D) 52p3 (E) None of the above.
*Saturday, May 7, 2011 at 6:33pm*

**trig**

A tree casts a shadow 50 yards long when the angle of the sun (measured from the horizon) is 30 degree. How tall is the tree in feet? (A) 150p3 (B) 50p3 (C) 150 (D) 75p3 (E) None of the above.
*Saturday, May 7, 2011 at 6:31pm*

**trig**

The hypotenuse of a right triangle has length 8 and one of the other edges has length 3. What is the sine of the angle opposite the edge of length 3? (A) 3/p55 (B) 3/8 (C)p55/8 (D) 55/64 (E) None of the above.
*Saturday, May 7, 2011 at 5:16pm*

**trig**

Determine the value of cos(theta) given that cos(pi âˆ’ theta) = .2 (A) p.96 (B) .2 (C) âˆ’.2 (D) âˆ’p.96 (E) None of the above.
*Saturday, May 7, 2011 at 5:15pm*

**trig**

Find the sum of all of the solutions to the equation cos(2x) âˆ’ sin2(x) âˆ’ 1 = 0 in theinterval 0 < x < 5 pi. (Use radian measure for x.) (A) 15pi (B) 0 (C) pi (D) 10pi (E) None of the above.
*Saturday, May 7, 2011 at 5:12pm*

**trig**

2. A circle has a radius of 10 centimeters. Find the length, in centimeters, of the arc intercepted by a central angle of 100 degree. (A) 50pi/9 (B) 100pi/9 (C) 500pi/9 (D) 18pi/5 (E) None of the above.
*Saturday, May 7, 2011 at 5:10pm*

**trig**

express the trig. ratios sinA,secA n tanA in terms of cotA.
*Saturday, May 7, 2011 at 5:49am*

**trig**

ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help AB = 23 CM
*Thursday, May 5, 2011 at 5:50pm*

**trig**

ABC is rightangled triangle. AD is the bisector of angle BAC. Angle DAC=15 degrees. X=CD. Find X. I know the answer is 7.1 but do not know how to do the actual sum. Can you please help.
*Thursday, May 5, 2011 at 5:00pm*

**trig**

(1/m)= (m-34)/(2m^2)
*Thursday, May 5, 2011 at 10:28am*

**trig**

angle a is acute and sin = u. find the other five trigonometric functions in the terms of u.
*Wednesday, May 4, 2011 at 8:21pm*

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