{ \left( { C }_{ 9 } \right) }^{ 2 }
Differentiate w.r.t. C_9
2C_{9}
Evaluate
C_{9}^{2}
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2C_{9}^{2-1}
The derivative of ax^{n} is nax^{n-1}.
2C_{9}^{1}
Subtract 1 from 2.
2C_{9}
For any term t, t^{1}=t.
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