$sin^2tsec^2t=sec^2t-1$
$\frac{d}{dx}x^2-y^2-7=0$
$y\left(x+1\right)+2\left(x+1\right)$
$\left(x-4\right)^2-\left(4-x\right)^2+\left(x-8\right)^2-x^2-25$
$\left(5a^4-3\right)^3$
$\int e^{\frac{x^4}{4}}x^3dx$
$\left(x-18\right)\left(x+3\right)$
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