If `x=cos(2t)and y=sin^(2)t`, then what is `(d^(2)y)/(dx^(2))` equal to?

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If `x=cos(2t)and y=sin^(2)t`, then what is `(d^(2)y)/(dx^(2))` equal to?
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How can I prove that dy/dx for this doesn't depend on t? please reply to me

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