$\left(4ab\right)^2-49$
$\left(\sec^2x-1\right)\csc^2x$
$-2y+5>3y-3$
$\sqrt{x}^2+1\:-x$
$+12xy^3+20xy^3$
$8.5-6.4$
$\sqrt{\:3\tan\left(z\right)\sec\left(z\right)}$
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