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The browser used for posting questions on this site is rubbish. It is quite useless for mathematics since it strips out most symbols so that we cannot tell what the question is meant to be.
If f(x) = (pi - x)*sec2x
then f'(x) = (pi - x)*2*sec2x*tan(x) - sec2x
Then, if it is f'(pi/4) that you require, the answer is 3*pi/4 - 1/2.
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