The derivative of sin(x) is cos(x).
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Afetr you take the first derivative you take it again Example y = x^2 dy/dx = 2x ( first derivative) d2y/dx2 = 2 ( second derivative)
You take the derivative using only one variable. The other variables act as constants.
you have to first find the derivative of the original function. You then make the derivative equal to zero and solve for x.
First find the derivative of each term. The derivative of any constant is zero, so d(1)/dx=0. To find the derivative of cos2x, use the chain rule. d(cos2x)/dx=-sin(2x)(2)=-2sin(2x) So the answer is 0-2sinx, or simply -2sinx
Find the derivative