$2a\cos\left(x\right)^2+2b\sin\left(x\right)^2$
$-10v+5v$
$\lim_{x\to0}\left(\frac{10}{x^4+14x^3+45x^2+60x}\right)$
$5x=6.7$
$\lim_{x\to\infty}\left(\frac{16x}{16x+1}\right)^{5x}$
$\lim_{x\to\infty}\left(\frac{e^n+1}{e^n}\right)$
$x^3-3x^2-24x+80$
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