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## anonymous 2 years ago 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 ??????

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1. anonymous

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

2. amistre64

cospi/2 = 0 soo thats not it

3. anonymous

it would be 0... thank u

4. amistre64

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

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