if for real value x cos a = x+1/x
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not possible. If x is less than 1 1/x is greater than 1 , r.h.s is g.t. 1 not possible. If x is g.t. 1, 1/x is l.t. 1 again rh.s g.t. 1. cos any angle cannot be g.t. 1.
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