differential equation!!

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How can I solve the differential equation?
C = 15ð(2Dh+(3/4)D²) + ë (94.25 Dh+35.34 D^2)/(pi D^2h/4)
first dC/dD?
second d^2C/dD^2?
first dC/dh?
second d^2C/dh^2?

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