indefinite-integration

Question: $\int_{{}}^{{}}{\frac{\tan (\log x)}{x}\ dx=}$

1) $\log \cos (\log x)+c$

2) $\log \sin (\log x)+c$

3) $\log \sec (\log x)+c$

4) $\log \text{cosec}(\log x)+c$

Solution:

Explanation: No Explanation

Integration by substitution

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