$5.5-70$
$\lim_{x\to0}\left(1+sin\left(\pi\:x\right)\right)^{\frac{1}{x}}$
$\cos^4\left(x\right)-\sin^4\left(x\right)=\cos2\left(x\right)$
$\frac{27x^6+8y^1}{3x^2+2y^5}$
$2a+3b-4c+b-5a+c-3c$
$\lim_{x\to\infty}5x-1$
$4y^3x^2-12xy+16x^3$
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