$\left(5x^2-y\right)^2$
$\sin\left(x\right)+\sin\left(y\right)=\:\frac{\sqrt{3}+1}{2}$
$2\cdot0.666$
$\cot^2\left(x\right)\cos^2\left(x\right)$
$-54+-18\:x\:+3$
$-4\left(x-2\right)+3\left(x+4\right)$
$\frac{\cot\left(y\right)}{1-\sin^2\left(y\right)}$
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