Show That the Equation Is Not an Identity by Finding $\cos x - \cos x \sin x = \cos ^ { 3 } x$

question 135

Multiple Choice

Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal.
- $\cos x - \cos x \sin x = \cos ^ { 3 } x$

• A) \(\frac { \pi } { 4 }\)
• B) \(\frac { \pi } { 2 }\)
• C) \(\pi\)
• D) 0

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