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4cos(ex)=2x+2−x\large 4\cos(e^{x})=2^{x}+2^{-x}4cos(ex)=2x+2−x Find the number of solutions of equation above.
You may use ln(2π)<log2(2+3)\ln(2\pi)<\log_2 (2+\sqrt{3})ln(2π)<log2(2+3).
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