$4x^2-\frac{4xy}{3}+\frac{y^2}{9}$
$\sin\left(90-x\right)=\frac{1-\sin^2x}{\cos x}$
$\frac{1-sin\left(x\right)-cos\left(2x\right)}{sin\left(2x\right)-cos\left(x\right)}$
$27^{9^{-4^{-2^{-1}}}}$
$\int10x\left(5x^2+1\right)dx$
$x2-15x+36=0$
$in\:\left(x^2-x+1\right)$
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