How do you solve 9 cos^3 x − 63 cos^2 x + cos x − 7 = 0 ?
1 Answer
Oct 25, 2015
No solution.
Explanation:
Pair
Factor out each group.
Factor out
For this to be true,
However, this doesn't make any sense because any real number that is squared must be positive.
Therefore, we can conclude that the equation has no solution.