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int_(pi/6)^(pi/4) " cosec "x dx |
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Answer» Solution :`I= int_(pi//6)^(pi//4) " cosec "x dx` `=[LOG |"cosec"x-COT x|]_(pi//6)^(pi//4)` `=log |"cosec ".(pi)/(4)-cot .(pi)/(6)|` `=log |sqrt(2)-1|-log |2-sqrt(3)|` `=log |(sqrt(2)-1)/(2-sqrt(3))|` |
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