Question
what is the smallest positive angle which satisfies the equation
2cosx-5cosx+2=0
2cosx-5cosx+2=0
Answers
-3 cos x = -2 ????
cos x = 2/3
x = inverse cos (.6666667) = 48.2 degrees
cos x = 2/3
x = inverse cos (.6666667) = 48.2 degrees
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