Discussion

Considering radian, value of cos 2.3π is

Answer: B

Convert the radian measure to degrees, using \( \pi \text{ radians} = 180^{\circ} \).

\[ 2.3\pi = 2.3 \times 180^{\circ} = 414^{\circ} \]

Subtracting a full turn:

\[ 414^{\circ} - 360^{\circ} = 54^{\circ} \]

\[ \cos 54^{\circ} = 0.587 \]

Cosine never exceeds 1, so the options above 1 can be discarded before any calculation.

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