$y=\frac{x^3+1}{e^{7x}}$
$\cos=\frac{12}{5}$
$-8a^{x-1}+8a^{x-1}$
$\int\left(\left(x-1\right)^2-\left(x+7\right)^2\right)^2dx$
$7n+4\left(5n-3\right)+15$
$-4a+\frac{1}{3}a$
$cos2x=cosx+1$
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