Solved papers for JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

done JEE Main Paper (Held On 19 May 2012) Total Questions - 1

• question_answer1) Suppose \[\theta \] and \[\phi (\ne 0)\] are such that \[(\theta +\phi ),\sec \theta \]and \[\sec (\theta -\phi )\] are in A.P. If \[\cos \theta =k\cos \left( \frac{\phi }{2} \right)\] for some k, then A; is equal to     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[\pm \sqrt{2}\]                                              
  done clear
  B)
                         \[\pm 1\]
  done clear
  C)
                         \[\pm \frac{1}{\sqrt{2}}\]                            
  done clear
  D)
                         \[\pm 2\]
  done clear
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