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int(pi//4)^(pi//2)cotxdx=?...

`int_(pi//4)^(pi//2)cotxdx=?`

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`int_(pi//4)^(pi//2)cotxdx`
`=int_(pi//4)^(pi//2)(​​cosx)/(sinx​)dx`
`=ln∣sinx∣_(π/2)​​^(π/4​)`
`=ln(sinπ/2​)−ln(sinπ/4​)`
`=ln(1)−ln(1/sqrt(2)​)`
...
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