Answer :

In this question the following formulas will be used:


cos (A + B) = cosAcosB – sinAsinB


cos (A - B) = cosAcosB+ sinAsinB


= cos x + cos 1200 cosx – sin120sinx + cos 1200cosx+sin120sinx


= cosx + 2cos120 cosx


=cosx + 2cos (90 + 30) cosx


= cosx + 2 (-sin30) cosx


=cosx - 2 cosx


=


=0.


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