$sec\:a\:+\:tan\:a=\:\frac{cos\:a}{1-sen\:a}$
$\int\frac{1}{2x^2+8x+25}dx$
$\int\left(4xe^{18x}\right)dx$
$\left(7n^3-x\right)^3$
$\int_0^2\left(-x^3+4x\right)dx$
$\frac{dx}{dy}=e^{4x+5y}$
$3\int\cos2xdx$
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