Question

prove that sin^4a-cos^4a+1=2sin^2a

Answer 1

Step-by-step explanation:

(sin2a+cos2a)(sin2a-cos2a)+1

(sin2a-cos2a)+1

(sin2a-(1-sin2a))+1

(sin2a-1+sin2a+1)

2sin2a

Hope it helps!!!