Question
Wed January 09, 2013 By: Aditya

Prove that Sin (40 + ?). Cos (10 + ?) – Cos (40 + ?). Sin (10 + ?) = 1 2

Expert Reply
Thu January 10, 2013
sin(40+Q).cos(10+Q)-sin(10+Q).cos(40+Q)=sin(40+Q-10-Q)
                                                             =sin30=1/2
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