$+15+\left|-1\right|$
$\frac{sec\left(45\right)}{tan\left(45\right)+cot\left(45\right)}$
$\sin2x\cos x$
$\lim_{x\to0}\left(\frac{\left(\left(e^x-1\right)sin\left(x\right)\right)}{e^x-cos\left(2x\right)-x}\right)$
$49c^2+56c+16$
$2\left(4x^4-9x^2+8x-12\right)$
$x^4+x^3-5x^2+3x$
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