$\cos a\cdot\left(1+\tan a\right)=\sin a+\cos a$
$\lim_{x\to infinity}\left(\frac{7x-sin\left(x\right)}{x^2+sin\left(x\right)}\right)$
$\left(17\cdot18\right)+\left(3\cdot18\right)$
$\frac{sinx}{cosx-cos^3x}=\frac{1}{sinxcosx}$
$\int_1^3\left(\frac{1}{1-2x}\right)dx$
$xy'+2y=x^2+x$
$\left(\sqrt[4]{4ab^4}\right)\left(\sqrt{2ab}\right)$
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