$\sin^2x-4\sin x-4=0$
$9n^{2}+4a^{2}-12an$
$3\left(m+n\right)-108$
$\frac{7^{m-1}-7^m}{7^{m-2}}$
$\int\left(x^2+2\right)\csc^2\left(x^3+6x+\frac{1}{2}\right)dx$
$1\cdot1\cdot\left(x^2\right)$
$\frac{x^6+x^3-2x^2+3}{x^2-2}$
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