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[" Q.9"," If "cos(x-y),cos x" and "cos(x...

[" Q.9"," If "cos(x-y),cos x" and "cos(x+y)" are in "H" .P.,then "cos x" sec "(y/2)" equals- ",[IT-1997],[," (A) "1," (B) "2," (C) "sqrt(2)," (D) None of these "]

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