$4\sin-2=3\sin$
$sin\left(2x\right)-2sin\left(x\right)+2sin^2\left(\frac{x}{2}\right)=0$
$\int\:\frac{3-x}{-x^2+x+2}dx$
$\frac{1}{4}\int\sqrt{u}du$
$x^2+4x+14=0$
$\int21x^2.\ln\left(x\right)dx$
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