1. $\cos \theta =\frac{1}{2}\left(x+\frac{1}{x}\right)$

• A. $-\frac{1}{2}\left(x+\frac{1}{x^2}\right)$
• B. $-\frac{1}{2}\left(x+\frac{1}{x^2}\right)$
• C. $-\frac{1}{2}\left(x+\frac{1}{x^2}\right)$
• D. $-\frac{1}{2}\left(x+\frac{1}{x^2}\right)$

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