How do you find the solution for #cosx - 1/cosx = 5/6# for [-180,180]?
1 Answer
Oct 21, 2015
Solve
Ans:
Explanation:
Call cos x = t and solve the quadratic equation for t.
Use the new Transformation Method.
Transformed equation -->
Factor pairs of (-36) --> (-3, 12)(-4, 9). This sum is 5 = -b. Then y1 = -4 and y2 = 9. Therefor, the 2 real roots of equation (1) are:
a.
b.