Find the slope of the tangent of the cur...

Find the slope of the tangent of the curve
(i) `y = (x^(3) -x) " at " x = 2`
(ii) `y = (2x^(2) + 3 sin x) " at " x = 0`
(iii) `y = (sin 2x + cot x + 2)^(2) " at " x = (pi)/(2)`

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The correct Answer is:

(i) 11 (ii) 3 (iii) `-12`

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