$4x\left(sec^2x\right)\left(2x\right)$
$\left(a^8-b^8\right)\left(a^8+b^8\right)$
$4-7\cdot\left(-5\right)-5+9$
$\int\frac{\sec x\tan x}{\sec x-1}dx$
$-4+9\cdot\frac{12}{36}-5+3$
$\frac{x^3-1x+9}{x+9}$
$\frac{dy}{dx}=y-\left(1+x^2\right)\sqrt{1-x^2}$
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