Principle Of Mathematical Induction

Question
CBSEENMA11013792

Show that: sin straight A. sin left parenthesis 60 degree minus straight A right parenthesis sin left parenthesis 60 degree plus straight A right parenthesis equals 1 fourth sin 3 straight A and deduce that sin 20 degree sin 40 degree sin 60 degree sin 80 degree equals 3 over 16.


Solution

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