Find the sum of n terms of the series 1/...

Find the sum of n terms of the series `1/2.5+1/5.8+1/8.11`…to n terms.

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UNITED BOOK HOUSE-TECHNO INDIA GROUP ACADEMIA,SOUTH KOLKATA.-EXERCISE

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Prove that, cos20^@cos40^@cos60^@cos80^@=1/16
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Find the sum of n terms of the series 1/2.5+1/5.8+1/8.11…to n terms.
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