$\left(1.65-1.68\right)$
$x^6+216y^3$
$6xy+7-4xy$
$\left(c-3\right)\left(c+5\right)$
$5-3+2-3+4$
$\left(x+2\right)x\left(x+3\right)$
$\frac{2sin^2\left(x\right)+3cos\left(x\right)-3}{sin^2\left(x\right)}=\frac{2cos\left(x\right)-1}{1+cos\left(x\right)}$
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