$-2\left(s+1\right)=10$
$x\frac{4}{9}\cdot y\frac{4}{9}$
$sin\left(x+y\right)+sin\left(x-y\right)=2sin\left(x\right)\cdot cos\left(y\right)$
$4x^2-8x+2$
$2\sqrt{100}$
$\left(-4+5\right)^2+1$
$\tan\left(\cos^{-1}\left(\frac{x}{3}\right)\right)$
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