$\frac{dy}{dx}=\frac{y}{1+senx}$
$\lim_{x\to0}\:\:\frac{\cos^2\left(x\right)}{x}$
$80+44+200$
$20 = r + 11$
$f\left(x\right)=\left(x^2+1\right)^7$
$4x^2+4x-285$
$6x-9x$
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