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Determine whether f(x)=-x//2+sinx is inc...

Determine whether `f(x)=-x//2+sinx` is increasing or decreasing on `(-pi//3,\ pi//3)` .

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`f(x) =frac{-x}{2}+sin x `
` f^{prime}(x) =frac{-1}{2}+cos x`
` Here,
frac{-pi}{3}` ...
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