If a=pi r2, find da/dr

1.	If a=pi r2, find da/dr
Answer» a=πr^2. Therefore,da/dr=d(πr^2)/dr=2πr.By applying product rule,d(πr^2)/dr=r^2 * d(π)/dr + π d(r^2)/dr=2πrNote that derivative of pi is zero as it is a constant and the rule d(r^x)/dr= x r^x-1 applies here

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