d/dx(ARCSIN((12+6*x*COS(2*pi/15))/(sqrt(x^2+5-2*x*SIN(2*pi/15)+4*x*COS(2*pi/15))*sqrt(53+x^2+4*x*COS(2*pi/15)-14*x*SIN(2*pi/15))))) = 0

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