$\frac{4x^3+16x^2+24x+15}{2x+2}$
$tan\left(\sqrt{7x}\right)$
$2a^2+11a-21=0$
$\int\left(e^x\left(5-e^x\right)^5\right)dx$
$4m^2-7nm-6mn$
$\int\:x\:sen\:7x\:dx$
$\left(d-4\right)^{2}$
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