Question

prove that √ 1 - sin² theta = costheta .​

Answer 1

Answer:

Step-by-step explanation:

√1-sin^2∅=cos ∅

Squaring on both sides,

(√1-sin^2∅)^2=cos^2∅

We get,

1-sin^2∅=cos^2∅

But we know from identities that,

sin^2∅+cos^2∅=1

So,1-sin^2∅=cos^2∅

Answer 2

Step-by-step explanation:

use sin²theta+cos²theta=1