Q. 135.0( 1 Vote )

State whether f(x

Answer :

f(x) = tan x – x


f’(x) = Sec2x – 1


Sec2x – 1 ≥ 0


Sec2x ≥ 1


1 + tan2x = Sec2x


1 + tan2x ≥ 1


tan2x ≥ 0


tan2x ≥ 0 x ϵ [0, 2π]


f(x) is increasing its domain.


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