Ask a New Question

Question

use the double angle formula to rewrite.

6cos^2-3

and


(cosx +sinx)(cosx-sinx)
12 years ago

Answers

Bosnian
cos ( 2 x ) = 2 cos ^ 2 ( x ) - 1


6 cos ^ 2 ( x ) - 3 =

3 [ 2 cos ^ 2 ( x ) - 1 ] =

3 sin ( 2 x )
12 years ago
Reiny
second one:

(cosx +sinx)(cosx-sinx)
=(cosx +sinx)(cosx-sinx) * (cosx + sinx)/(cosx + sinx)
= (cos^2 x + 2sinxcosx + sin^2 x)/(cos^2 x - sin^2 x)
= (1 + sin 2x)/cos 2x
or
1/cos 2x + sin 2x/cos 2x
= sec 2x + tan 2x
12 years ago

Related Questions

Using a double angle formula how would you find the exact value of this expression? Cos²105° -... Use the double angle identities to find sin2x if sinx= 1/square of 17 and cosx<0 . Give exact answ... Use the double angle formula to verify the identity cotxsin2x=1+cos2x Use a Double- or Half-Angle Formula to solve the equation in the interval [0, 2π). (Enter your answe... Use a double-angle formula to rewrite the expression. 6 sin x cos x Use a double-angle formula to find the exact value of cos2x when sinx = 3/5, where pi/2 < x < pi.... use a double-angle formula to find the exact value of cos2u when sinu=5/13 , where pi/2<u<pi So f... Double Angle Formula. If the double angle formula for cos2(u) = 2cos^2(u)-1, then write the double... Use a double-angle formula to evaluate the expression. cos(7π/2)= Use a double-angle formula to rewrite the expression. 8−8(cosθ−sinθ)^2
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use