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1. $\cos (\frac{n \land^{-}}{2})$

A. $- 1$
B. $- 1$
C. $- 1$
D. $- 1$

Answer: Option B

Explanation:

<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>log</mi><mn>2</mn><mo> </mo><mi>log</mi><msqrt><msup><mi>e</mi><mo>∧</mo></msup><mo> </mo><msup><mi>e</mi><mo>∧</mo></msup></msqrt><mo> </mo><mn>2</mn></math>

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