Question #f620d
1 Answer
Nov 29, 2017
Explanation:
Replace
Since a + b + c = 0, use shortcut. The 2 real roots are:
cos x = 1 and
a. cos x = 1 --> x = 0, x = 180, and x = 360.
b.
Calculator and unit circle give 2 solutions:
Inside the interval [0, 90], there are only 2 solutions:
x = 0, and