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Evaluate : int(0)^(pi//4) tan x . sec x ...

Evaluate : `int_(0)^(pi//4) tan x . sec x dx`

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`int_(0)^(pi//4) tan x . sec x dx`
`=[sec x ]_(0)^(pi//4) =sec .(pi)/(4) - sec 0`
` =(sqrt(2)-1)`
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