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Evaluate : int0^(pi/4)secxdx...

Evaluate : `int_0^(pi/4)secxdx`

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`int_0^(pi/4)secxdx`
`=ln(tanx+secx)_0^(pi/4)`
`=ln(tan(pi/4)+sec(pi/4))-ln(tan(0)+sec(0))`
`=ln(1+sqrt(2))-ln(0+1)`
`=ln(1+sqrt(2))`
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