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x in (-oo:+oo)
cos(68) = x/10.3 // - x/10.3
cos(68)-(x/10.3) = 0
cos(68)-0.09708738*x = 0
cos(68)-0.09708738*x = 0 // - cos(68)
-0.09708738*x = -cos(68) // : -0.09708738
x = -cos(68)/(-0.09708738)
x = 10.29999986*cos(68)
x = 10.29999986*cos(68)
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