$x^4+2x^2y^2+ay^4$
$x^2y^4-121$
$b^2-30b+6$
$2\left(3-2x\right)=-4-2x$
$40\cdot30$
$\frac{\cos x-\sin x}{\sin x\cdot\cos x}$
$v^2-10v+25$
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