Cos4x=-1/3

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Solution for Cos4x=-1/3 equation: 


8;1440;26;960;0;0

21;1440;41;960;0;0

3;288;3;720;0;0

X-(7/x) = 90

x+4*y+z-2;3*x+y+z-1;3*y-2*x-1

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