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Respective ratio of the profits received by ‘A’, ‘B’ and ‘C’ = (24000 × 3):(15000 × 6):(18000 × 12) = 4:5:12 Therefore, profit received by ‘B’ = 29400 × (5/21) = Rs. 7000
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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