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Prove that funciton given by (i) f(x...

Prove that funciton given by
(i) `f(x)=x^(2)` is
(a) Strictly increasing in ` x in (0,oo)`
(b) Strictly decreasing in ` x in (-oo,0)`
(ii) `f(x)=tan x ` is strictly increasing in ` x in (npi-(pi)/(2),n pi+(pi)/(2))`, where ` n in I`.

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