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[" 17.If "x=a(cos t+t sin t)" and "y=a(s...

[" 17.If "x=a(cos t+t sin t)" and "y=a(sin t-t cos t)," find "(d^(2)y)/(dx^(2))],[" 18.If "f(x)=|x|^(3)" .show that "f''(x)" exists for all real "x" and find it "]

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