Question

plz solve this que ​

Answer 1

here is your ans hope it helps you********

Answer 2

Step-by-step explanation:

consider

cos4^a+sin4^a

=(cos2a)^2+(sin2a)^2

cos^a+sin^a=(cosa+sina)^-2*cosa*sina

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