$\left(3e^{\left(x\right)}tany\right)+\left(\left(1-e^{\left(x\right)}\right)sec^{\left(2\right)}\right)y'$
$8x+7y-8x-3y$
$1-121x^4$
$3\left(4x^2-2x\right)-2\left(3x^2+x\right)$
$43\cdot20$
$-26+12+14-26-30+7-40+46+12$
$\frac{3x^2y+15}{x^2-25\:}$
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