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Questions  >>  CBSE XII  >>  Math  >>  Model Papers
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Q)

If $ x = \cos\: t ( 3-2 \: \cos^2 t)\: and \: y = \sin \: t ( 3-2 \sin^2\: t)$ find the value of $ \large\frac{dy}{dx} $ at $ t = \large\frac{\pi}{4}$

$(a)\; sint\qquad(b)\; 3cost-sint\qquad(c)\; sin2t .sint\qquad(d)\; 3cost-3sin2t .sint$

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