$\tan\left(70\right)\frac{300}{y}$
$\left(a-7x\right)^2$
$\left(3ab2c\:-\:4ad2\right)\:\left(3ab2c\:+\:4ad2\right)\:$
$sin4x=-2sin2x$
$\left(\frac{m^3}{2}+2\right)\left(\frac{m^3}{2}-2\right)$
$-2-\left(-1+-3\right)$
$25x^2-10x\:+\:1$
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