$\left|65-23\right|42$
$\left(4\sqrt{2x+3}\right)^2$
$496\cdot2$
$8xy+7xy-xy+3xy-xy$
$\frac{-2}{x}+\frac{7}{\left(x-1\right)}$
$\frac{sen7a}{sena}-2cos2a-2cos4a-2cos6a$
$x^2\frac{dy}{dx}=y^2\left(1-x\right)$
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