Evaluate
\frac{90}{a+13}
Differentiate w.r.t. a
-\frac{90}{\left(a+13\right)^{2}}
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\frac{15\times 6}{13+a}
Calculate the square root of 36 and get 6.
\frac{90}{13+a}
Multiply 15 and 6 to get 90.
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