Is it true that (1-cos^2x)=((1+cosx)(1-cosx)?

1 Answer
May 8, 2018

Yes,it is true.

Explanation:

Here,

(1-cos^2x)=(1+cosx)(1-cosx)

We know that,

(a-b)(a+b)=a^2-b^2

So,

RHS=(1-cosx)(1+cosx)

RHS=(1)^2-(cosx)^2

RHS=1-cos^2x

RHS=LHS