2 cos-13cos9 -13-cos3 -13-cos5 -13-

The correct option is A 0 Given expression = cos10π/13+cos8π/13+cos3π/13+cos5π/13=0 ...

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Product of Trigonometric Ratios in Terms of Their Sum

2 cosπ/13cos9...

Question

$2 c o s \frac{π}{13} c o s \frac{9 π}{13} + c o s \frac{3 π}{13} + c o s \frac{5 π}{13} =$

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Similar questions

2 cos \frac{π}{13} cos \frac{9 π}{13} + cos \frac{3 π}{13} + cos \frac{5 π}{13}

2 cos \frac{π}{13} cos \frac{9 π}{13} + cos \frac{3 π}{13} + cos \frac{5 π}{13}

2 c o s \frac{π}{13} c o s \frac{9 π}{13} + c o s \frac{3 π}{13} + c o s \frac{5 π}{13} = 0

2 cos \frac{π}{13} cos \frac{9 π}{13} + cos \frac{3 π}{13} + cos \frac{5 π}{13} = 0

2 cos \frac{π}{13} cos \frac{9 π}{13} + cos \frac{3 π}{13} + cos \frac{5 π}{13}

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