+0

0
165
1

For how many values of x such that

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

true

Apr 20, 2019
edited by Guest  Apr 20, 2019
edited by Guest  Apr 20, 2019
edited by Guest  Apr 20, 2019

#1
+7725
0

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