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Find dw/dt using the appropriate chain rule for w=x^2+y^2+z^2 where x=8tsin(s), y=8tcos(s) and z=5st^2

Find dw/dt using the appropriate chain rule for w=x^2+y^2+z^2 where x=8tsin(s), y=8tcos(s) and z=5st^2

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