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etermine the sub-interval of (-(pi)/(2),...

etermine the sub-interval of `(-(pi)/(2),(pi)/(2))`, in which f(x)=tan x-4x is increasing.

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The correct Answer is:
`therefore" "x in (-(pi)/(2), -(pi)/(3))uu ((pi)/(3), (pi)/(2))`
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