Question

cos 4 x is equal to 1 minus sin square x cos square x ​

Answer 1

Step-by-step explanation:

Cos4x = Cos(2*2x)

{Cos2O = 1-2Sin²O}

Cos4x = 1-2Sin²2x

= 1-2(2Sinx*Cosx)²

= 1-2(4Sin²x*Cos²x)

= 1-8Sin²x*Cos²x