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x in (-oo:+oo)
cos(90) = x/35 // - x/35
cos(90)-(x/35) = 0
cos(90)-1/35*x = 0 // - cos(90)
-1/35*x = -cos(90) // : -1/35
x = -cos(90)/(-1/35)
x = 35*cos(90)
x = 35*cos(90)
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