$\left(6k+9h\right)\left(6k-9h\right)$
$\left(3x+2\right)+\left(3x+2\right)+\left(3x-2\right)$
$\:x^2y-8xy+16y^2$
$\left(6x+y^2\right)dx+y\left(2x-3y\right)dy$
$12-9\cdot5+10$
$39=3w$
$\frac{\cos\left(x\right)+\sin\left(x\right)^3-\sin\left(x\right)}{\sin\left(x\right)}$
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