Question

sin4-cos4=sin²-cos²​

Answer 1

Answer:

ans

Step-by-step explanation:

sin(A)^4 - cos(A)^4

= ( sin²(A) - cos²(A) )( sin²(A) + cos²(A) ) Since sin²(A) - cos²(A) = 1:

= ( sin²(A) - cos²(A) )(1)

= sin²(A) - cos²(A)