indefinite-integration

Question: To evaluate $\int_{{}}^{{}}{\frac{{{\sec }^{2}}x}{(1+\tan x)(2+\tan x)}\ dx}$, the most suitable substitution is



1) $1+\tan x=t$
2) $2+\tan x=t$
3) $\tan x=t$
4) None of these
Solution: Explanation: No Explanation
Integration by substitution

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