$\sin\left(30\right)\cdot\tan\left(30\right)+\cos\left(30\right)=\sec\left(30\right)$
$-\tan\left(4x\right)^{-1}=-\pi$
$\left(4x+3b\right)^4$
$\left(2x-5y\right)\left(2x+2y\right)$
$\frac{4x^2-36}{2x+6}$
$2.03-1.96$
$ba^4\cdot\left(2ba^4\right)^{-3}$
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