Question

Cos4 A- Sin4 A is equal to

Answer 1

Answer:

cos4A-sin4A

= cos (2×2A)-sin(2×2A)

= (2cos^2 2A)-(1-2sin^2 2A)

= 2cos^2 2A-1-1+2sin^2 2A

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

= 2-2

= 0

HOPE THIS HELPS YOU OUT