$sin\:^2.\:cos\:w$
$\lim_{x\to\infty}\left(\frac{5x^9}{3e^x+5}\right)$
$\left(a+6\right)\left(a+6\right)=0$
$\frac{dy}{dx}=\frac{1}{e^{3x}\left(4-\sqrt{y}\right)}$
$2\sin x-\cos^2x=\sin^2x$
$\frac{3x^3+5x}{x^2+1}$
$20a-15b-25c+35d$
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