Question

prove that coss^2A-sinn^A = 2cos^2A-1=1-2sin^2A

Answer 1

@AravindG

Answer 2

I know that cos^2A- 1- sin^2A

Answer 3

=*

Answer 4

easy to get both results substitute sin^2x and cos^x from sin^ x+cos^2 x=1

Answer 5

we need to get rid of sin for the first bit I think

Answer 6

yep !

for example for first one

cos^2 a-sin^2 a=cos^2 a -(1-sin^2 a )=cos^2 a +cos^2 a -1
=2cos^2 a-1

Answer 7

ahI got the first part

Answer 8

yay

Answer 9

now can you try second part? :)

Answer 10

yes thanks

Answer 11

yw :)