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Find the equation of normal to the curve...

Find the equation of normal to the curve `x^3` =`4y` which passes through (1,2).

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MODERN PUBLICATION-APPLICATIONS OF DERIVATIVES-PROBLEM
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  2. Show that x/(1+ x tan x,) x in (0,pi/2)is maximum when x = cos x.

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  3. Find the extreme values of y = cos x(1+sin x), x in [0,2pi]

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