Web Analytics

Verified Answer :

syed514

cos 8x cos 2x - sin 8x sin 2x = 1/2 sqrt(2+sqrt(3)

scme1702

cos(A - B) = cos(A)cos(B) - sin(A)sin(B)
Thus,
cos(8x)cos(2x) - sin(8x)sin(2x)
= cos(8x - 2x)
= cos(6x)

Related Questions