$4x^2-\left(2x+y\right)^2+\left(x+y\right)^2-x^2$
$\frac{2sin\left(x\right)-cos\left(x\right)}{sin\left(x\right)+cos\left(x\right)}=1$
$8y\frac{dy}{dx}=x$
$\frac{1-x}{x}\le2$
$\left(\csc x\:+\:\cot x\right)\left(\csc x\:-\:\cot x\right)\:=\:1$
$cos^4x\:csc^2x$
$-4x^2-49x-151=-7x^2-82x-235$
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