Thursday

April 17, 2014

April 17, 2014

Number of results: 8,953

**Precalculus**

How would you solve this trig function: cos2x=sin^2-2 how do you know what trig identities to use?
*Saturday, August 6, 2011 at 5:39pm by Jess*

**trig/precalculus**

M = sin x/cos c = tan x
*Tuesday, December 13, 2011 at 10:49am by Damon*

**trig/precalculus**

Hmm. By the time you get to trig, a little algebra I should not throw you. M w cosx = w sinx M = w sinx / w cosx = sinx/cosx = tanx Where did you get stuck on the way?
*Tuesday, December 13, 2011 at 12:31am by Steve*

**Precalculus**

sin^2 x + cos^2 x = 1 VERY IMPORTANT trig identity
*Thursday, January 26, 2012 at 10:37pm by Damon*

**Precalculus/Trig 6**

follow the steps that I showed you in previous post
*Monday, October 8, 2012 at 9:05am by Reiny*

**precalculus**

how you do you use the power-reducing formula to find the exact value of the trig function: sin^2(37pi/12)
*Sunday, December 12, 2010 at 10:51pm by Jessica*

**Precalculus/Trig 6**

Find the exact value of the following trigonometric functions: sin(13pi), cos(14pi), tan(15pi)
*Monday, October 8, 2012 at 9:05am by Greg*

**Precalculus with Trig**

Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))
*Sunday, April 7, 2013 at 1:38pm by Natalie*

**3-D Coordinates Polar coordinates Precalculus Trig**

Sorry, never mind. I figured it out.
*Wednesday, December 18, 2013 at 10:59am by Jeff*

**3-D Coordinates Polar coordinates Precalculus Trig**

thank you that helped !
*Wednesday, December 18, 2013 at 10:59am by Cambridge*

**Precalculus Someone please help**

You know you are in quadrant IV by CAST, the cosine, (and the secant), are positive in that quadrant. All other trig ratios are negative. You also know you are dealing with a 9-40-41 right-angled triangle, since 9^2 + 40^2 = 41^2. so x=40, y = -9 , and r = 41 Now you can state...
*Monday, December 6, 2010 at 10:19am by Reiny*

**precalculus**

I would draw a right-angled triangle, marking the "vertical height" with 1808, and the base angle as 25.2º does the trig ratio opposite/hypotenuse ring a bell?
*Tuesday, November 18, 2008 at 8:10pm by Reiny*

**Precalculus/Trig 5**

Find the exact value of thet following trigonometric functions: tan(5pi/6) tan(7pi/6) tan(11pi/6)
*Monday, October 8, 2012 at 9:03am by Greg*

**precalculus**

thank you my precalculus is now done - chemistry is next- can't wait!!
*Sunday, January 15, 2012 at 5:53pm by Sara*

**Precalculus/Trig 5**

sin(26) = (120+15)/guywire where guy wire is the length of the guy wire
*Monday, January 14, 2013 at 1:43am by Jennifer*

**Precalculus/Trig 5**

Let its length be h After making a sketch , I can see that sin 26° = 105/h h = 105/sin26 = 239.52 or 239.5 ft
*Monday, January 14, 2013 at 1:43am by Reiny*

**Precalculus**

I'm interested in teaching myself Precalculus and would like to find a good book with lesson plans and assignments. Any ideas?
*Friday, January 8, 2010 at 2:40pm by Sheryl*

**Precalculus with Trig**

make a sketch of a rightangled triangle label the base angle Ø, then opposite side is x hypotenuse is 1 then the adjacent side is √(1 - x^2) so cos(arcsin(x)) = √(1-x^2)1
*Sunday, April 7, 2013 at 1:38pm by Reiny*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. M...
*Tuesday, December 13, 2011 at 12:31am by A*

**Precalculus/Trig 3**

The degree measure of an angle theta is 40 degrees. What is the radian Measure of theta? at what point P does the terminal ray intersect the unit circle (what is the ordered paid P(____, ___)?
*Monday, October 8, 2012 at 9:02am by Greg*

**trig/precalculus**

A crate weighing w pounds sits on a ramp positioned at an angle of x with the horizontal. The forces acting on this crate are modeled by the equation Mwcosx = wsinx, where M is the coefficient of friction. What is an expression for M in terms of x? A. M = tanx B. M = cotx C. ...
*Tuesday, December 13, 2011 at 10:49am by Joesph*

**Precalculus/Trig 5**

A radio transmission tower is 120 feet tall. How long should a guy wire be if it is to be attached 15 feet from the top and is to make an angle of 26 degrees with the ground? Give your answer to the nearest tenth of a foot
*Monday, January 14, 2013 at 1:43am by Anonymous*

**Precalculus/Trig 5**

A radio transmission tower is 120 feet tall. How long should a guy wire be if it is to be attached 15 feet from the top and is to make an angle of 26 degrees with the ground? Give your answer to the nearest tenth of a foot
*Monday, January 14, 2013 at 1:43am by Anonymous*

**Precalculus with applications**

The course iam taking is Advanced Mathematical Concepts/Precalculus with Applications. Thank for your help.
*Wednesday, November 19, 2008 at 4:13am by Mary*

**Precalculus**

Consider the equation 7sin^2x - (4sin2^x)/cosx = -1 a) Put the equation in standard quadratic trig equation form. Why is it 7sin^2x - 8sinx + 1 =0?
*Friday, January 27, 2012 at 8:21pm by Melissa*

**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 by john*

**3-D Coordinates Polar coordinates Precalculus Trig**

Hi. I don't understand why you multiply by 50*pi/180. The 50 degrees is the difference in the longitude, but why isn't that divided by 360? Why the pi/180? If someone could clear that up I would appreciate it.
*Wednesday, December 18, 2013 at 10:59am by Jeff*

**Precalculus with applications**

f(x)=-4x^2 g(x)=2/x so g(f(x))= 2/(-4x^2)=-1/2x^2 I am wondering why you titled this Precalculus with applications? This problem is certainly content for algebra II. Is someone playing with course names again?
*Wednesday, November 19, 2008 at 4:13am by bobpursley*

**Precalculus**

That is simply the trig identity sin^2 x + cos^2 x = 1 You can show it easily with a right triangle with 90 deg at C where a^2 + b^2 = c^2 sin A = a/c cos A = b/c so sin^2 A = a^2/c^2 cos^2 A = b^2/c^2 and we know c^2 sin^2 A + c^2 cos^2 A = c^2 so sin^2 A + cos^2 A = 1
*Saturday, March 24, 2012 at 12:43pm by Damon*

**Pre-calculus**

So, since you know Cos x= 0.8, plug in to the calculator Cos inv of 0.8. Do the same for Cos Y= 12/13. X=36.9 degrees Y=22.6 degrees I think that where you are in precalculus, you have to know these trig identities. You MUST memorize them as they are the basis of good ...
*Friday, February 17, 2012 at 12:58am by yoyoma*

**Precalculus Test**

I have a precalculus test coming up and I'm not really understanding how to do everything. Please help. 1. Find the angle betweem 0 and 2pi which is coterminal to the angle -(7pi)/5. Now convert the angle you just found to degrees.
*Monday, April 8, 2013 at 4:41pm by marie darling*

**Precalculus/Trig 5**

You should be able to make a quick sketch of the following right-angled triangles 30° - 60° - 90° ---> π/6rad - π/3rad - π/2 ---> 1 -- √3 -- 2 and 45° - 45° - 90° --> π/4 - π/4 - π/2 ---> 1 - 1 - √2 You should also know the...
*Monday, October 8, 2012 at 9:03am by Reiny*

**Trig 30**

x/2 = 2pi/3 yields a unique solution of x = 4pi/3 Does this answer come from some trig equation? Your subject title suggests that. In that case find the period of the trig function, then add k(period) to 4pi/3, k an integer.
*Friday, March 19, 2010 at 7:59pm by Reiny*

**precalculus**

Precalculus-------Give an example of three functions f,g,h none of which is a constant function such that? fog=foh but g is not equal to h. I tried with many functions but not getting like f=x g=1+x then h=?or any other example so that we get fog=foh
*Sunday, September 23, 2012 at 2:57am by Fatima*

**Precalculus/Trig 3**

180° = π radians , (memorize this relationship) so 1° = π/180 radians then 40° = 40(π/180) = ...
*Monday, October 8, 2012 at 9:02am by Reiny*

**Precalculus**

I've tried many times to get the equation to balance using trig identities like half-angle formulas, power-reducing formulas, and double angle formulas, but I couldn't get the equation to equal out. I only need to work one side to make it equal to the other, like a kind of ...
*Thursday, December 2, 2010 at 10:11pm by Christina*

**math**

could someone please refresh my memory of the basic trig functions? ex) cos^2 + sin^2 = 1? That is a trig identity. http://www.sosmath.com/trig/Trig5/trig5/trig5.html
*Thursday, April 12, 2007 at 10:18pm by raychael*

**Trig**

please show me again in trig way
*Saturday, May 17, 2008 at 12:40pm by Doni --i didnt get this one can please show me the trig way a little bit more clrealy*

**trig**

Subtract 2 pi from 7pi/3. The trig functions of 7 pi/3 will be the same values as the trig functions of pi/3, which is 60 degrees. The cosine of pi/3 is 1/2. That makes the secant 3. The tangent is sqrt3 You should be able to look up or figure out the other funtions of that ...
*Tuesday, January 12, 2010 at 9:50pm by drwls*

**Math - Solving Trig Equations**

Start by recalling the most important identity. My math teacher calls this "the #1 Identity." sin^2(x) + cos^2(x) = 1 We want to simplify our trig equation by writing everything in terms of sine. Let's solve the #1 Identity for cos^2(x) because we have that in our trig ...
*Wednesday, November 21, 2007 at 6:29pm by Michael*

**calculus**

If you are weak in math, what you need is a precalculus site (or algebra/trig/functions). I would not try to get ahead of the calculus course you will be taking. Try this one: http://jwbales.home.mindspring.com/precal/
*Monday, July 28, 2008 at 9:36pm by drwls*

**Precalculus**

Print out the "trig wheel" on this page, it will come in handy http://ll043.k12.sd.us/slides/trigonometry.htm
*Monday, November 22, 2010 at 10:15am by Reiny*

**3-D Coordinates Polar coordinates Precalculus Trig**

The U.S.S. Lollipop is on assignment in the Atlantic Ocean. It travels from a longitude of 70 degrees west to 20 degrees west, along the latitude of 40 degrees north. How far does it travel? (Assume that the radius of the Earth is 6,400 km.) Erm I don't know how to solve this...
*Wednesday, December 18, 2013 at 10:59am by Cambridge*

**Trig**

Find all of the solutions between 0 and 2pi: 2sin(x)^2 = 2 + cos(x)
*Thursday, November 13, 2008 at 9:16pm by Trig*

**trig**

its in the first chapter of my trig course. i know its review frm geometry and alg
*Friday, November 14, 2008 at 11:25am by y912f*

**trig**

simplify to a constant or basic trig function.. 1+tan(x)/1+cot(x)
*Sunday, March 14, 2010 at 1:14pm by hilde*

**Trig**

This subject is not trig. You will have to use your own graphic calculator.
*Sunday, May 15, 2011 at 12:10am by drwls*

**Trig**

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

**trig**

first of all, this is not trig, secondly your expression makes no sense.
*Monday, January 7, 2013 at 10:03pm by Reiny*

**trig**

what is the exact value of 7pi for all trig func.?
*Monday, February 1, 2010 at 10:23pm by claire*

**trig**

write a product of two trig functions that equals 1.
*Sunday, November 6, 2011 at 9:38pm by Dani*

**trig**

any calculus text will list the trig functions and their derivatives.
*Thursday, January 19, 2012 at 8:45am by Steve*

**Trig**

Solve the following trig equation 2cos(x-π/6)=1
*Tuesday, January 31, 2012 at 2:51am by Matt*

**trig**

I figured out that tan(theta)=-1 is 3pi/4+n(pi)
*Thursday, March 22, 2012 at 12:28pm by TRig*

**TRIG**

Find one numerical value for cot x/cos x = 5
*Monday, November 12, 2012 at 7:31am by TRIG HELP*

**Trig **

csc thea= -2, quadrant 4. what are the six trig functions?
*Monday, May 6, 2013 at 4:17pm by Shay*

**trig**

What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
*Monday, April 21, 2008 at 8:53pm by Priya*

**trig**

What kind of reflection does the trig function y = cos(4x/3 minus 1) have?
*Tuesday, April 22, 2008 at 12:03am by Chaitanya*

**trig**

how do i do this? give the signs of the six trig functions for each angle: 74 degrees?
*Wednesday, December 3, 2008 at 6:59pm by Tay*

**trig**

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

**trig**

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

**trig**

find the 5 trig ratios when sin theta = -5/13 and lies in quadrant 3
*Wednesday, September 14, 2011 at 10:38pm by karen*

**graphing trig functions**

I see the equation of a straight line, not a trig function
*Sunday, May 20, 2012 at 10:15pm by Reiny*

**Trig**

surely you have learned the basic definitions of the trig functions, tanØ = y/x = 4/3
*Sunday, January 20, 2013 at 5:17pm by Reiny*

**3-D Coordinates Polar coordinates Precalculus Trig**

Along the equator, if you travel an angle of θ, your distance is rθ. The travel is along the 40° latitude, so moving through an angle of θ° of longitude, you only travel rθcos40°. The Lollipop moved 50°, so it traveled (6400)(50*π/180)(cos40°) = 4278 km
*Wednesday, December 18, 2013 at 10:59am by Steve*

**trig**

What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
*Sunday, April 20, 2008 at 10:27pm by Joshua*

**trig**

What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
*Monday, April 21, 2008 at 12:33am by Joshua*

**trig**

What is the shift along x of the following trig functions? y = (3sinx/2) + 4 y = -2sin(x)-4 y = sin(-3x + 3)
*Monday, April 21, 2008 at 12:34am by Amandeep*

**Trig**

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

**Trig**

find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?
*Thursday, September 1, 2011 at 9:16pm by ALISON*

**trig**

I don't know to find the derivative of the following trig functions. Please help. f(x)= cotx h(x)= secx i(x)= cscx
*Thursday, January 19, 2012 at 8:45am by Claire*

**trig**

TRIG Identities, Gr. 12: Prove: cot4x=1-tan^2x/2tan2x
*Thursday, May 23, 2013 at 2:56pm by Josh*

**trig**

What is the range of the trig function sin(-3x+3)?
*Monday, April 21, 2008 at 12:35am by Chaitanya*

**trig**

how to i find the six trig values for (7pi/3)
*Tuesday, January 12, 2010 at 9:50pm by Rak*

**Trig**

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

**trig**

what's the single trig. function of cos6xcosx-sin6xsinx
*Thursday, May 17, 2012 at 4:44pm by MIK*

**trig**

write 2+2 squareroot of 3i in trig form.
*Thursday, May 17, 2012 at 5:01pm by ky*

**trig**

no idea what "p" and "o" represent, or which trig function is required.
*Monday, July 22, 2013 at 8:09pm by Reiny*

**Trig**

Does anybody know a good website that will hlp me with finding the six trig functions of a point NOT on the unit cricle?
*Wednesday, September 16, 2009 at 7:59pm by Anonymous*

**trig**

use the unit circle to find the exact value for all the trig functions of è=2ð/3.
*Monday, February 1, 2010 at 9:54pm by Anonymous*

**trig**

find the 5 other trig functions if cos(theta) = square root of 2/2 and cotangent is less than 0
*Wednesday, June 9, 2010 at 7:04pm by kelly*

**trig**

I don't know to find the derivative of the following trig functions. Please help. f(x)= cotx h(x0= secx i(x)= cscx
*Thursday, January 19, 2012 at 8:45am by Claire*

**trig! please help!**

to bobpursely: i need to simplify the expression using trig identities. and no i meant for there to only be x
*Sunday, May 13, 2012 at 8:59pm by Brianna*

**Physics (trig)**

If the angle is x, tan x = 12.3333/19.2 Better review your trig ratios...
*Wednesday, June 19, 2013 at 9:10pm by Steve*

**trig**

Do you mean find the six trig functions (sin, cos, tan, csc, sec, and cot)?
*Wednesday, December 3, 2008 at 6:59pm by Anonymous1*

**TRIG**

(cotx + cscx(1-cosx)= SIN x
*Monday, November 12, 2012 at 7:33am by TRIG HELP*

**Trig**

Not trig Since it is already factored ..... x = ± 5, or x = -2
*Friday, January 18, 2013 at 11:39am by Reiny*

**Trig**

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

**trig**

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

**trig**

Let Q be an acute angle such that sinQ=.6. Find the values of the following using Trig Identities: cosQ and tanQ
*Tuesday, July 27, 2010 at 10:06pm by student*

**Trig**

Use Trig identities to verify that sec^4(x)-tan^4(x)=1+2tan^2(x), Only work with one side of the equation
*Tuesday, March 1, 2011 at 5:23pm by Anonymus*

**trig**

Just noticed this was for trig, not calculus. Algebraically, note that a(y) is a parabola, whose vertex occurs where y=60/4 = 15.
*Thursday, August 29, 2013 at 9:44pm by Steve*

**PreCalculus (PLEASE HELP, IM BEGGING!)**

Can anyone please explain these problems to me?? I really need help!I need to simplify these trig expressions but I don't understand how my teacher is doing it at all and I have a quiz on this tomorrow! I've really been trying but I just don't get it! 1)Mulitply: [cosx/(1-cosx...
*Saturday, May 5, 2012 at 2:09am by Valerie*

**trig**

You have to state where the right angle is. Once that is established, this looks like a very fundamental and basic trig question.
*Wednesday, April 16, 2008 at 10:54pm by Reiny*

**trig**

What is the shift along x of the trig function y = cos(4x/3 minus 1)? Any link of proof would be appreciated if you have one Thank you
*Monday, April 21, 2008 at 8:51pm by Priya*

**trig**

What is the shift along y of the trig function y = cos(4x/3 minus 1)? Any link of proof would be appreciated if you have one Thank you
*Monday, April 21, 2008 at 8:52pm by Priya*

**trig**

Suppose that q is in standard position and the given point is on the terminal side of q. Give the exact value of the indicated trig function for q.
*Monday, February 21, 2011 at 11:50am by Anonymous*

**Trig**

Did you notice that trig co-functions come in pairs: sine ---cosine secant --- cosecant tangent --- cotangent so csc(4π/11) = ......
*Wednesday, May 11, 2011 at 4:53am by Reiny*

**Trig**

The next two steps in solving this trig identity question are ??? 1/csctheta x costheta x sintheta x sectheta = sinsqtheta arghhh need help please
*Saturday, December 17, 2011 at 7:43pm by Don*

**Trig**

looks like "homework dumping" to me I have two of them for you. Please indicate where you are having difficulties with these standard type of trig questions.
*Tuesday, September 17, 2013 at 11:24pm by Reiny*

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