Find an exact solution to the equation. 1=12cos(3x+1)-5 ok i thought i knew how to do this one, i came up with x= (arccos(1/2)-1)/3 but it was wrong, if someone could tell me what i did wrong that would be awesome...thanks mathlete
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Originally Posted by mathlete Find an exact solution to the equation. 1=12cos(3x+1)-5 ok i thought i knew how to do this one, i came up with x= (arccos(1/2)-1)/3 but it was wrong, if someone could tell me what i did wrong that would be awesome...thanks mathlete $\displaystyle 12 \cos (3x + 1) - 5 = 1$ $\displaystyle \Rightarrow \cos (3x + 1) = \frac 12$ $\displaystyle \Rightarrow 3x + 1 = \frac {\pi}3 + 2 k \pi, \mbox{ or } \frac {5 \pi}3 + 2n \pi$, for $\displaystyle n,k \in \mathbb{Z}$ now continue
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