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
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.