x*sin(x)
Apply the product rule:
f(x)=xf{\left(x \right)} = xf(x)=x; to find ddxf(x)\frac{d}{d x} f{\left(x \right)}dxdf(x):
Apply the power rule: xxx goes to 111
g(x)=sin(x)g{\left(x \right)} = \sin{\left(x \right)}g(x)=sin(x); to find ddxg(x)\frac{d}{d x} g{\left(x \right)}dxdg(x):
The derivative of sine is cosine:
The result is: xcos(x)+sin(x)x \cos{\left(x \right)} + \sin{\left(x \right)}xcos(x)+sin(x)
The answer is:
x*cos(x) + sin(x)
2*cos(x) - x*sin(x)
-(3*sin(x) + x*cos(x))