What is $x \to \infty lim (4 x^{2} + x - 2 x)$ ?

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What is the principal value of $cos^{- 1} (- \frac{1}{2})$ ?
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What is $x \to 0 lim \frac{1 - cos ( 4 x )}{x ^{2}}$ ?
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Let $f (x) = \frac{2 x ^{2} - x - 6}{x ^{2} - x - 2}$ . If the graph has vertical asymptotes at $x = p_{1}, \dots, p_{n}$ and a horizontal asymptote $y = H$ , what i…

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