$\frac{\sin^22x}{\sin^2x}=4-4\sin^2x$
$4\csc^2\theta\:-25=0$
$\lim_{x\to3}\left(\frac{sin\frac{\pi x}{18}-\frac{1}{2}}{5x-15}\right)$
$7=3c-2$
$\frac{sinx}{\cos\left(x\right)+1}+\frac{\cos\left(x\right)-1}{\sin\left(x\right)}=0$
$12h^2-46h+42$
$3y=3x^{4x^2}$
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