indefinite-integration

Question: $\int_{{}}^{{}}{\frac{{{\sec }^{2}}x\ dx}{\sqrt{{{\tan }^{2}}x+4}}=}$

1) $\log \left[ \tan x+\sqrt{{{\tan }^{2}}x+4} \right]+c$

2) $\frac{1}{2}\log \left[ \tan x+\sqrt{{{\tan }^{2}}x+4} \right]+c$

3) $\log \left[ \frac{1}{2}\tan x+\frac{1}{2}\sqrt{{{\tan }^{2}}x+4} \right]+c$

4) None of these

Solution:

Explanation: No Explanation

Integration by substitution

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