cos^2(pi/6)-sin^2(pi/6) - solution

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Solution for cos^2(pi/6)-sin^2(pi/6) equation:

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0.25^-2*16^-7 = 0

7;4;5;6

0.25^-2*16^-7 = 0

7;1;9;49

250-4*x^3-(30*x^2) = 0

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