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Question
Evaluate the following:
`int ("d"x)/(1 + cos x)`
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Solution
I = `int ("d"x)/(1 + cos x)`
= `int 1/(2 cos^2 x/2) "d"x`
= `1/2 int sec^2 x/2 "d"x`
= `1/2 * 1/(1/2) tan x/2 + "C"`
= `tan x/2 + "C"`
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