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For how many values of x such that

0 less than x less than 60 is cosine of x equals 0,4 

true

 

remember it is in radians

 Apr 20, 2019
edited by Guest  Apr 20, 2019
edited by Guest  Apr 20, 2019
edited by Guest  Apr 20, 2019
 #1
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Q: Solve cos x = 0.4 for 0 rad < x < 60 (rad?)

\(\cos x = 0.4\\ x = 2n\pi + \arccos \left(0.4\right)\text{ or }x = 2n\pi - \arccos(0.4)\)

Just find out how many of these general solutions fit inside the range.

 Apr 21, 2019

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