## britbrat4290 Group Title 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 ?????? 11 months ago 11 months ago

1. Psymon Group Title

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

2. amistre64 Group Title

cospi/2 = 0 soo thats not it

3. britbrat4290 Group Title

it would be 0... thank u

4. amistre64 Group Title

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