Cos^-1(cos4)=

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The value of x for which $c o s^{- 1} (c o s 4) > 3 x^{2} - 4 x$ is

x = {cos}^{- 1} (cos 4) : y = {sin}^{- 1} (sin 3)

x

c o s^{- 1} (cos 4) > 3 x^{2} - 4 x

a (cos B cos C + cos A)

= b (cos C cos A + cos B)

= c (cos A cos B + cos C) .

a (\cos B \cos C + \cos A) = b (\cos C \cos A + \cos B) = c (\cos A \cos B + \cos C)

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