$\int-\frac{2x}{\sqrt{1-4x^2}}dx$
$8c^2-88c+242$
$12-32+15-10-9+2+7-13$
$\left(3x-\frac{1}{9}\right)\left(3x+\frac{1}{9}\right)$
$x^22x+1$
$\int e^x\frac{1}{cos\left(e^x\right)}dx$
$\int7^xdx$
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