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Differentiate log{cot(pi/4+x/2)} with re...

Differentiate `log{cot(pi/4+x/2)}` with respect to `x` :

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Let `y=log{cot(pi/4+x/2)}`
so.`(dy)/(dx)=d/(dx) [log{cot(pi/4+x/2)}]`
`=1/{cot(pi/4+x/2)} xx d/ (dx) {cot(pi/4+x/2)}`
`=-1/{ 2 cos(pi/4+x/2) sin(pi/4+x/2)}`
`=-sec x`
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