$4a^2b+6a^2b^4-2a^2$
$x\left(y\:+\:4\right)\:+\:\left(y\:+\:4\right)$
$63=56\left(1+0.004\left(x-20\right)\right)$
$\int y.sen\left(y\right)dy$
$f\:\left(x\right)\:=\left(5x\:-2x^4\right)^3$
$x2-5\cdot6$
$y=yx^2-1.1y$
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