How do you find all values of x in the interval [0, 2pi] in the equation #2 + cos2x = 3cosx#?
2 Answers
Solution set is
Explanation:
As
or
if
But as cosine of an angle is also positive in 4th quadrant, another solution could be
Hence solution set is
Explanation:
from the given
Recall that
so that the equation becomes
solution by factoring
Equate both factors to zero
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