Find the value of given trigonometric function.Round your answer to four decimal places. $\cos ( - 2.5 )$
A) $\cos ( - 2.5 ) \approx - 0.7011$
B) $\cos ( - 2.5 ) \approx 0.8011$
C) $\cos ( - 2.5 ) \approx - 0.8011$
D) $\cos ( - 2.5 ) \approx - 0.9011$
E) $\cos ( - 2.5 ) \approx - 0.6011$

Question

Find the value of given trigonometric function.Round your answer to four decimal places.​ $\cos ( - 2.5 )$ ​
A) $\cos ( - 2.5 ) \approx - 0.7011$
B) $\cos ( - 2.5 ) \approx  0.8011$
C) $\cos ( - 2.5 ) \approx - 0.8011$
D) $\cos ( - 2.5 ) \approx - 0.9011$
E) $\cos ( - 2.5 ) \approx - 0.6011$

Quizplus · Accepted Answer

The cosine function is even, so $\cos(-2.5) = \cos(2.5)$. Calculating $\cos(2.5)$ gives approximately -0.8011.

Find the Value of Given Trigonometric Function cos⁡(−2.5)\cos ( - 2.5 )cos(−2.5)

Find the Value of Given Trigonometric Function $\cos ( - 2.5 )$