Differentiate w.r.t. r
2\pi r
Evaluate
\pi r^{2}
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2\pi r^{2-1}
The derivative of ax^{n} is nax^{n-1}.
2\pi r^{1}
Subtract 1 from 2.
2\pi r
For any term t, t^{1}=t.
Examples
Quadratic equation
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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