cos^-1[0.707/cos(3x)]

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Solution for cos^-1[0.707/cos(3x)] equation: 


(8-x)*(x^2-(2*x)-8) = 0;x

x

(2*x)/(x^2)+1 = 0;x

x

y = 11*x^2+7*x+19;11;7;19

-((7^2-(4*11*19))/(4*11))

-(7/(2*11))

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