1.

Show that Cosx*cosx/2- cos3x*cos9x/2=sin7x*sin8x

Answer» o
cosxcosx/2-cos3xcos9x/2=sin7x/2sin4xcheck the link below for solutionhttp://www.learncbse.in/ncert-exemplar-problems-class-11-mathematics-chapter-3-trigonometric-functions/


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