$\lim_{x\to0}\frac{6^{-2x}-1}{7x}$
$\frac{dy}{dx}=6y+3$
$25\sin^2\left(x\right)-25\cos^2\left(x\right)$
$6ax^2+21ax+9a$
$x^2+6x=-11$
$\left(4w^6-2y^2\right)^2$
$\int_1^3e^{\frac{-x}{2}}dx$
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