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If a=pi r2, find da/dr

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If a=pi r2, find da/dr

    • Posted by Jaismeen Kaur 5 years, 6 months ago

    CBSE > Class 11 > Physics
    • 1 answers

    Rohit Krishna 5 years, 6 months ago

    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 =2πr Note 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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