$\int\left(1-3x\right)^7dx$
$y=xy+y$
$\frac{z+w}{h+0z}$
$\left(-3\right)\cdot\left(-4\right)+\left(-5\right)\cdot\left(-2\right)$
$\:\left(sin2x+cos2x\right)^2=1+sin4x$
$\left(a+2b\right)n\:-\:bn\:$
$7cos2x-\:sen2=1\:$
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