Question

Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal. cos x - cos x sinx = cos3 x



pi/4 or pi/2 ??????

Answer 1

cos(3x) or cos^3(x)?

Answer 2

cospi/2 = 0 soo thats not it

Answer 3

it would be 0... thank u

Answer 4

now that depends on of its \(\cos^3x\) or \(\cos 3x\)