indefinite-integration

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

1) ${{[\log (\sec x+\tan x)]}^{2}}+c$

2) $\frac{1}{2}{{[\log (\sec x+\tan x)]}^{2}}+c$

3) ${{\sec }^{2}}x+\tan x\sec x+c$

4) None of these

Solution:

Explanation: No Explanation

Integration by substitution

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