assuming that you are referring to a function:
f(y) = y×y
or better put:
f(y) = y2
Then it's derivative would be:
f'(y) = 2y
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"Derivative of"
well, the second derivative is the derivative of the first derivative. so, the 2nd derivative of a function's indefinite integral is the derivative of the derivative of the function's indefinite integral. the derivative of a function's indefinite integral is the function, so the 2nd derivative of a function's indefinite integral is the derivative of the function.
Trig functions have their own special derivatives that you will have to memorize. For instance: the derivative of sinx is cosx. The derivative of cosx is -sinx The derivative of tanx is sec2x The derivative of cscx is -cscxcotx The derivative of secx is secxtanx The derivative of cotx is -csc2x
The derivative of xe is e. The derivative of xe is exe-1.
The derivative of 40 is zero. The derivative of any constant is zero.