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Question Number 33146 by Ahmad Hajjaj last updated on 11/Apr/18

$$\mathrm{If}\mathrm{the}\mathrm{expression}$$ $$exp\{(1+\mid \cos x\mid +{\cos }^{2}x+\mid {\cos }^{3}x\mid +{\cos }^{4}x$$ $$+....\mathrm{\infty }){\log }_{e}4\}\mathrm{satisfies}\mathrm{the}\mathrm{equation}$$ $$y^2-20y+64=0\mathrm{for}0<x<\pi ,\mathrm{then}\mathrm{the}\mathrm{set}$$ $$\mathrm{of}\mathrm{values}\mathrm{of}x\mathrm{is}$$

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