Principle Of Mathematical Induction

Question
CBSEENMA11013793

Show that:  cos open parentheses fraction numerator 2 straight pi over denominator 15 end fraction close parentheses cos open parentheses fraction numerator 4 straight pi over denominator 15 end fraction close parentheses cos open parentheses fraction numerator 8 straight pi over denominator 15 end fraction close parentheses cos open parentheses fraction numerator 16 straight pi over denominator 15 end fraction close parentheses equals 1 over 16

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