$\frac{cos\left(a+b\right)}{sin\left(a\right)cos\left(b\right)}$
$100a^2-4b^2$
$45a^2-81b^2$
$\csc^4x-2\csc^2x+1$
$3=15-x$
$\frac{dy}{dt}+4y=12$
$\log x^{11}\left(x+2\right)$
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