precalc
 👍 0
 👎 0
 👁 1,094

 👍 0
 👎 0
Respond to this Question
Similar Questions

Math  Trig  Double Angles
Prove: cos4x = 8cos^4x  8cos^2x + 1 My Attempt: RS: = 4cos^2x (2cos^2x  1) + 1 = 4 cos^2x (cos2x) + 1 LS: = cos2(2x) = 2cos^2(2x)  1 = (cos^2(2))  cos^2(2x))  1  Prove: 8cos^4x = cos4x + 4cos2x + 3 My Attempt: RS: =
asked by Anonymous on November 17, 2007 
Precalculus with Trigonometry
Prove or disprove the following identity: (sin(10x))/(sin(x)+sin(9x)) = (cos(5x))/(cos4x))
asked by Natalie on April 4, 2013 
Math, please help
Which of the following are trigonometric identities? (Can be more then one answer) tanx cosx cscx = 1 secxcosx/secs=sin^2x 1tanxtany=cos(x+y)/cosxcosy 4cosx sinx = 2cosx + 1  2sinx Find all solutions to the equation cosx
asked by Jill on January 14, 2014 
PreCalculus
Find all solutions to the equation in the interval [0, 2pi) cos4xcos2x=0 So,this is what i've done so far: cos4xcos2x=0 cos2(2x)cos2x (2cos^2(2x)1)(2cos^2(x)1) No idea what to do next.
asked by Maria on March 19, 2012 
TRIG!
Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6 x=1  (3/4)sin^2 2x work on one side only! Responses Trig please help!  Reiny, Monday, February 23, 2009 at 4:27pm LS looks like the sum of cubes sin^6 x +
asked by hayden on February 23, 2009

Trigonometry
Show algebraically how to confirm that cos2x=cos^2xsin^2x using the sum and difference identities
asked by Nikki on July 15, 2012 
trig
Prove the identity sin(3 pi /2 + x) + sin(3pi/2 x) = 2cosx
asked by Rick on February 28, 2008 
Trigonometry
Simplify the expression using trig identities: 1. (sin4x  cos4x)/(sin2x cos2x) 2. (sinx(cotx)+cosx)/(2cotx)
asked by Tasha on July 15, 2012 
precalculus
For each of the following determine whether or not it is an identity and prove your result. a. cos(x)sec(x)sin^2(x)=cos^2(x) b. tan(x+(pi/4))= (tan(x)+1)/(1tan(x)) c. (cos(x+y))/(cos(xy))= (1tan(x)tan(y))/(1+tan(x)tan(y)) d.
asked by anonymous on April 14, 2013 
Math
1. Power reducing formulas can be used to rewrite 8sin^2 xcos^2 x as 1cos4x. True or False? 2. Find the exact value of cos15 degrees using a suitable half angle formula. square root of 2+root3 / 2? 3. Find the exact value of
asked by mysterychicken on June 3, 2013
You can view more similar questions or ask a new question.