$6xy+6y+x+1$
$\frac{w^2-9}{6w^2+w-1}.\frac{2w+1}{w^2-9}$
$\frac{sin\left(x\right)-sin\left(3x\right)}{cos\left(x\right)+cos\left(3x\right)}=-tan\left(x\right)$
$\left(15t-8v\right)\left(15t+8v\right)$
$441.005-248.6$
$\left(-5\right)\left(-9\right)\left(-6\right)\left(-4\right)\left(-3\right)$
$\left(10c+15d\right)^2$
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