$5x^{-2}y^{-3}z\:75x^{-2}y^4z^{\frac{3}{2}}$
$-xy2+6xy2$
$z^2+z-6$
$\:\frac{secx}{cos^2x}$
$1a\:+\:1a$
$\int cos^4\frac{5x}{3}dx$
$y3\:+\:343$
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