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a=cos2π15cos4π15cos8π15cos16π15 is the 1st term of a geometric progression with common ratio 4a. If the sum of this infinite progression is p, then the value of 6p is |
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Answer» a=cos2π15cos4π15cos8π15cos16π15 is the 1st term of a geometric progression with common ratio 4a. If the sum of this infinite progression is p, then the value of 6p is |
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