Question

Sin^4 - cos^4 = k^4 , then sin^2 - cos^2 is ?

Answer 1

Answer:

k^4

Step-by-step explanation:

a2-b2=(a+b)(a-b)

let a=sin^2 and b=cos^2

(sin^2 +cos^2)(sin^2 - cos^2)=k^4

(1)(sin^2- cos^2)=k^4