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Evaluate the Trigonometric Function Using Its Period as an Aid cos⁡23π4\cos \frac { 23 \pi } { 4 }

Question 48

Multiple Choice

Evaluate the trigonometric function using its period as an aid.​ cos⁡23π4\cos \frac { 23 \pi } { 4 } ​


A) cos⁡23π4=−22\cos \frac { 23 \pi } { 4 } = - \frac { \sqrt { 2 } } { 2 }
B) cos⁡23π4=−2\cos \frac { 23 \pi } { 4 } = - \sqrt { 2 }
C) cos⁡23π4=2\cos \frac { 23 \pi } { 4 } = \sqrt { 2 }
D) cos⁡23π4=22\cos \frac { 23 \pi } { 4 } = \frac { \sqrt { 2 } } { 2 }
E) cos⁡23π4=∞\cos \frac { 23 \pi } { 4 } = \infty

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