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In A B C Prove that cos^2A/2+cos^2B/2+...

In ` A B C` Prove that `cos^2A/2+cos^2B/2+cos^2C/2lt=9/4dot` In `cos^2A/2+cos^2B/2+cos^2C/2=y(x^2+1/(x^2))` then find the maximum value of `ydot`

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