[" 13.If for real values of "x,cos theta...

[" 13.If for real values of "x,cos theta=x+(1)/(x)" ,then "],[[" (a) "theta" is an acute angle "," (b) "theta" is a right angle "],[" (c) "theta" is an obtuse angle "," (d) No value of "theta" is possible "]]

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