$\left(3x^m+4y^n\right)\left(3x^m+7yn\right)$
$-\cos a-11=2\cos a-9$
$\frac{2x}{xy}$
$\sin\left(2x\right)\frac{\sin\left(x\right)}{1-\cos\left(x\right)}$
$\left(-6z\right)\left(-4z^2\right)$
$-15238+-4253$
$s_{\text{eft}}\left(a\right)+3=4-\cos^{2}\left(a\right)$
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