$3\sin^2z$
$\left(4h^2\cdot3h^3\cdot h\right)^3$
$secx+cscxcotx$
$\left(-3a^{n+4}b^{n+1}\right)\left(-4a^{n+2}b^{n+3}\right)$
$\left(7a+3b-5c\right)^2$
$\left(5z+2w\right)^2$
$\left(+2\right)\left(-2.3\right)$
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