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cos6x+ 6cos4x+ 15cos2x+10/ cos5x+ 5cos3x+ 10cosx

cos6x+ 6cos4x+ 15cos2x+10/ cos5x+ 5cos3x+ 10cosx

Grade:11

1 Answers

Vijay Mukati
askIITians Faculty 2590 Points
6 years ago
Hint. Use the formula for cosa + cosB and try to convert the summation term into product terms.

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