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• Derivative Step by Step
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• Identical expressions

• -x*cos(x) - sin(x) = zero
• minus x multiply by co sinus of e of (x) minus sinus of (x) equally 0
• minus x multiply by co sinus of e of (x) minus sinus of (x) equally zero
• -xcos(x) - sin(x) = 0
• -xcosx - sinx = 0

• Similar expressions

• -x*cos(x) + sin(x) = 0
• x*cos(x) - sin(x) = 0
• -x*cosx - sinx = 0