$90+19a+a^2$
$\left(\frac{2}{3}\:m^4n^5-z\right)^4$
$sin^{2\:}\theta\:\:sec^2\:\theta\:\:+\:4\:tan\:\theta\:\:-\:3\:=\:0$
$\frac{tan^2\left(x\right)}{1-cos^2\left(x\right)}=2$
$-0.50\cdot1$
$8^0+9^1$
$-8x^3+8x$
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