Find the Exact Value cos(450)
Problem
Solution
Identify the angle and determine if it is within the standard range of
0 to360 Since450 is greater than360 we must find a coterminal angle.Subtract multiples of
360 to find the coterminal angle.
Evaluate the cosine function at the coterminal angle. The value of
cos(450) is equivalent to the value ofcos(90)
Determine the exact value using the unit circle. At
90 the coordinates are(0,1) Sincecos(θ) corresponds to thex coordinate:
Final Answer
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