indefinite-integration

Question: $\int_{{}}^{{}}{\frac{1}{x}{{\sec }^{2}}(\log x)dx=}$

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

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

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

4) $\sec (\log x)\ .\ \tan (\log x)+c$

Solution:

Explanation: No Explanation

Integration by substitution

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