Question: (a) Find cos 3 x dx. (b) Find cos 5 x dx. (c) Find cos 7 x dx. (d) Explain how to find cos 15

(a) Find ∫cos3 x dx.
(b) Find ∫cos5 x dx.
(c) Find ∫cos7 x dx.
(d) Explain how to find ∫cos15 x dx without actually integrating.

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