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12% of the cost price = 4190 – 3782 = 408 CP = (408* 100) /12 = Rs. 3400 Alternate Method: CP = (100 * Difference in SP)/ % difference in profit = (100 * 408)/12 = Rs. 3400
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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Simplify the given equation: