find the range of cosx
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The function f(x) = cosx has all real numbers in its domain, but its range is −1 ≤ cosx ≤ 1. The values of the cosine function are different, depending on whether the angle is in degrees or radians. The function is periodic with periodicity 360 degrees or 2π radians.
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Cos and Sin have Maximum and Minimum Values Set by Mr. Pythagoras Long Back [-1 ,1]. so may I thank him for finding solution and You for asking this interesting one !
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