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21+3cosx−10⋅2−1+2cosx+22+cosx−1=0 \large 2^{1+3\cos x} - 10 \cdot 2^{-1+2\cos x} + 2^{2+\cos x} - 1 = 0 21+3cosx−10⋅2−1+2cosx+22+cosx−1=0
If xxx in the interval 0≤x<2π0 \leq x < 2 \pi 0≤x<2π, find the sum of all possible values of xxx satisfying the equation above.
Give your answer to 2 decimal places.
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