indefinite-integration

Question: $\int_{{}}^{{}}{{{\cos }^{5}}x\ dx=}$

1) $\sin x-\frac{2}{3}{{\sin }^{3}}x+\frac{1}{5}{{\sin }^{5}}x+c$

2) $\sin x+\frac{2}{3}{{\sin }^{3}}x+\frac{1}{5}{{\sin }^{5}}x+c$

3) $\sin x-\frac{2}{3}{{\sin }^{3}}x-\frac{1}{5}{{\sin }^{5}}x+c$

4) None of these

Solution:

Explanation: No Explanation

Integration by substitution

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