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Question 1
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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