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x in (-oo:+oo)
cos(63) = x/12 // - x/12
cos(63)-(x/12) = 0
cos(63)-1/12*x = 0 // - cos(63)
-1/12*x = -cos(63) // : -1/12
x = -cos(63)/(-1/12)
x = 12*cos(63)
x = 12*cos(63)
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