$2-2a+a^2-a^3\cdot1+a$
$f\left(x\right)=-x-4$
$12-2x\:x\:2$
$4\:+\:2s\:=\:10$
$\log\left(\frac{y-6}{y-4}\right)$
$sin\left(3x\right)sin\left(5x\right)+cos\left(3x\right)cos\left(5x\right)$
$10x^4y^215y^2$
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