Question

prove
cos(^2)x-sin(^2)x=1-2sin(^2)x

Answer 1

Answer:

Step-by-step explanation:

$cos^2x-sin^2x=1\\\\cos^2x+sin^2x=1\\\\so~cos^2x=1-sin^2x\\cos^2x-sin^2x=1-sin^2x-sin^2x=1-2sin^2x$