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

To evaluate \[\int_{{}}^{{}}{\frac{{{\sec }^{2}}x}{(1+\tan x)(2+\tan x

1.	To evaluate \[\int_{{}}^{{}}{\frac{{{\sec }^{2}}x}{(1+\tan x)(2+\tan x)}\ dx}\], the most suitable substitution is
A.	\[1+\tan x=t\]
B.	\[2+\tan x=t\]
C.	\[\tan x=t\]
D.	None of these
Answer» D. None of these

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

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