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Show that (i) int(0)^(pi//2)f(sinx) d ...

Show that (i) `int_(0)^(pi//2)f(sinx) d x=int_(0)^(pi//2)f(cos x) d x` (ii) `int_(0)^(pi//2)f(tan x) d x=int_(0)^(pi//2)f(cot x) d x` (iii) `int_(0)^(pi//2)f(sin 2 x) sin xd x = int_(o)^(pi//2)f(sin 2x).cosx d x`

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