$\int \cos ^ { 3 }$ X Dx &Nbsp; [Hint $\cos ^ { 2 }$

Short Answer

$\int \cos ^ { 3 }$ x dx   [Hint: $\cos ^ { 2 }$ x = 1 - $\sin ^ { 2 }$ x.]
Enter your answer with any coefficients in front as integers or reduced fractions of form $\frac { a } { b }$ .
No parentheses around arguments of functions.