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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 17

  • question_answer
    If \[x=2\cos t-\cos 2t\] It and \[y=2\sin t-\sin 2t,\] then the value of \[\frac{{{d}^{2}}y}{d{{x}^{2}}}\] at \[t=\frac{\pi }{2}\] is ____.

    Answer:

    -1.5


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