Question

show that cospower4 theta-sinpower4 theta​

Answer 1

cos^4 - sin^4 =

(cos^2 - sin^2) (cos^2 + sin^2)

= cos^2 - sin^2

= 1 - 2sin^2

= 2cos^2 - 1

Answer 2

Answer:

The ans is not complete...

But by simplifying it comes out to be

(cos θ + sin θ)(cos θ - sin θ)

Step-by-step explanation:

The solution is attached