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x in (-oo:+oo)
cos(11) = x/6.6 // - x/6.6
cos(11)-(x/6.6) = 0
cos(11)-0.15151515*x = 0
cos(11)-0.15151515*x = 0 // - cos(11)
-0.15151515*x = -cos(11) // : -0.15151515
x = -cos(11)/(-0.15151515)
x = 6.60000007*cos(11)
x = 6.60000007*cos(11)
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