$sin3a-2cosa\:sin2a+sina=0$
$\left(64+36x^4\right)$
$\int\left(\frac{1-x^2}{sqrt\left(1+x^2\right)}\right)dx$
$\left(\frac{7}{2}x^3-\frac{3}{4}y^2\right)^2$
$\int\frac{1}{1-\left(x-1\right)^2}dx$
$13.5\cdot13.5$
$6f-f$
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