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Originally Posted by Cryptic
actually, this isn't my homework
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very well then.
A=cos x
2A^2+6A-3=0
The quadratic cannot be factored so we use the quadratic equation:
A = (-3+/- sqrt 15)/2
the negative will give A<-1 which is impossible for A = cos x.
cos x = (-3 + sqrt15)/2
Not solvable anaytically. Numerically, x = 1.1191....