$\sin\left(a+\pi\right)=-\sin\left(a\right)$
$ea\:y=\frac{x}{\sin\left(x\right)}$
$7x-3x=12$
$24m^2+24mn+4n^2$
$\int x\left(9x-2\right)^2dx$
$ai+bi-ai$
$x^2-17+72$
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