$-8+7;-5-6$
$\frac{1+\cot\left(a\right)}{1+\tan\left(a\right)}$
$\left(2f+3g\right)^2$
$\frac{1}{\sin^2\left(x\right)}=\csc^2\left(x\right)$
$2^3+2^2+2^1+2^0-2^{-1}-2^{-2}-2^{-3}$
$sin\left(2t+4\right)$
$\frac{d}{dx}-2y=e^{3x}$
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