" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
cos²x - sin²x = 1 - 2.sin²x
= 1 - 2(3/5)²
=1 - 2(9/25)
= 1 - 18/25 = 7/25