Dufferential equation-Plz

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C = 15*pi*(2*D*h+(3/4)*D²) + L* (94.25*D*h+35.34*D^2)/(pi*D^2*h/4)
first dC/dD?
second d^2C/dD^2?
first dC/dh?
second d^2C/dh^2

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