Diver red n z cos r in of the r en fil in the fin be blanks

Diver red n z cos r in of the r en fil in the fin be blanks

Solution

sin²x cos²x

cos 2x=1-2sin²x           and   cos 2x=2cos²x - 1

sin²x= 1/2 (1-cos2x)    and    cos²x= 1/2(1+cos2x)

sin²x cos²x=1/4(1-cos2x)(1+cos2x)   = 1/4(1-cos²2x   1/4 - 1/4(cos²2x)