$\left(5x+6\right).\left(5x-4\right)$
$\frac{\left(coseca-cota\right)^2+1}{seca\left(coseca-cota\right)}=\:2cota$
$7-2,2-2,3$
$\frac{49a^4b^{-3}c^3}{21a^{-2}b^1c^6}$
$\int\frac{3x+4}{\left(x-1\right)^2}dx$
$\int4x\:tan\:\left(x^2+8\right)dx$
$\int_0^4x\:e^xdx$
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