Let \( z=(\cos x)^{5} \) and \( y=\sin x \). Then the value of \( \...

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Let \( z=(\cos x)^{5} \) and \( y=\sin x \). Then the value of \( \frac{d^{2} z}{d y^{2}} \) at \( x=\frac{2 \pi}{9} \) is
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