$4\left(x+y\right)^2-4\left(x+y\right)\left(x-y\right)+4\left(x-y\right)^2$
$\sin^2\left(x\right)-2\sin\left(x\right)-3$
$4\:x\:-4\:<1$
$\lim_{x\to0}\left(9x\right)^x$
$2\ln\left(x\right)=2$
$-10+16-\left(25\right)\:-\left(-12\right)$
$4x^2-20x+15=-12$
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