$380=-21\cos\left(\frac{2\pi}{29.5}d\right)+384$
$\left(2x^3+xy\right)^2-\left(2x^3-xy\right)^2$
$\left(7x^3\:-6y^4\right)^3$
$15d-24d+9$
$x\:+\:6\:>\:4x\:-\:6\:$
$\frac{2\tan\frac{1}{2}y}{1+\tan^2\frac{1}{2}y}\equiv\sin y$
$\frac{4m+4}{m+1}=\frac{5m}{2m-3}$
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