If A - B - C - - the maximum value of cos A - cos B - cos C can have is -

If A + B + C =π, then the maximum value cos A + cos B + cos C can have is = 3/2. The proof of this beyond the scope of this chapter. ...

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If A + B + C ...

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If A + B + C = $π,$ the maximum value of cos A + cos B + cos C can have is --

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\frac{3}{2}

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π,

π,

If A + B + C = $π,$ the maximum value of cos A + cos B + cos C can have is --

\frac{a cos A + b cos B + c cos C}{a + b + c}

{cos}^{- 1} a + {cos}^{- 1} b + {cos}^{- 1} c = π

(a \sqrt{1 - a^{2}} + b \sqrt{1 - b^{2}} + c \sqrt{1 - c^{2}})

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