$\frac{d_y}{d_x}\:-\:x^2=\:x^2.y$
$8\cdot\left(-5\right)+2+-6$
$\cot\left(2x\right)=\csc\left(2x\right)-\tan\left(x\right)$
$\frac{10}{x};\:x=-5$
$8^7.8^4$
$-2x-x+1$
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