$3y+3+y+y$
$2\sin\left(x\right)+\cos\left(2x\right)=1$
$21a+28-a^2$
$\sec x\tan x-5\csc^2x$
$-1\left(-5\right)\left(-5\right)\left(3\right)$
$4x^2+9^2$
$\left(x^2-xy-y\right)^2$
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