$\sin\left(x-\frac{\pi}{2}\right)=-\:\cos\left(s\right)$
$x=y^2-2$
$b^2+3b-70$
$\frac{dx}{dy}=\frac{2.5-2c\left(y\right)}{4+y}$
$\cos2\left(x\right)=2\sin\left(x\right)\cos\left(x\right)$
$\left(+1\right)^3\left(-1\right)^3$
$6a\left(7a+9\right)$
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