indefinite-integration

Question: The value of $\int_{{}}^{{}}{\frac{\sin x}{{{\cos }^{2}}x}\ dx}$ is



1) $\sin x+k$
2) $\tan x+k$
3) $\sec x+k$
4) $\tan x+\sec x+k$
Solution: Explanation: No Explanation
Integration by substitution

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