Apply the quotient rule, which is:
dxdg(x)f(x)=g2(x)−f(x)dxdg(x)+g(x)dxdf(x)
f(x)=1 and g(x)=sin(x).
To find dxdf(x):
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The derivative of the constant 1 is zero.
To find dxdg(x):
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The derivative of sine is cosine:
dxdsin(x)=cos(x)
Now plug in to the quotient rule:
−sin2(x)cos(x)