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Qn #1612
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00:00
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If x = a cos t, y = b sin t, then $\frac{d^{2}y}{dx^{2}}$ is
A.
$\frac{-b^{4}}{a^{2}y^{3}}$
B.
$-\frac{b^{4}}{a^{2} x^{3}}$
C.
$\frac{b}{ay^{4}}$
D.
$\frac{a^{4}}{bx^{3}}$
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Qn #1410
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The equation of the tangent at any point of the curve $x=acos2t$, $y=2\sqrt{2}a sint$ with $m$ as its slope is
A.
$$y=mx+a\left ( m-\frac{1}{m} \right )$$
B.
$$y=mx-a\left ( m+\frac{1}{m} \right )$$
C.
$$y=mx+m\left ( a+\frac{1}{a} \right )$$
D.
$$y=amx+a\left ( m-\frac{1}{m} \right )$$
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