Differentiate w.r.t. y
21
Evaluate
21y
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\frac{\mathrm{d}}{\mathrm{d}y}(21y)
Combine 6y and 15y to get 21y.
21y^{1-1}
The derivative of ax^{n} is nax^{n-1}.
21y^{0}
Subtract 1 from 1.
21\times 1
For any term t except 0, t^{0}=1.
21
For any term t, t\times 1=t and 1t=t.
21y
Combine 6y and 15y to get 21y.
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