$25b^2-121x^2$
$\frac{dy}{dx}=\left(\cos^2x-\sin^2x\right)\cos^2y$
$13\int\left(sin\left(x\right)cos\left(x\right)\right)dx$
$\int\left(x\sqrt{16-x}\right)dx$
$12-8-7+5-1$
$3x-18=3$
$\int\frac{\sqrt{t^2+9}}{t}dt$
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