1.

int_(0)^(1) (dx)/(x^(2)+2x sin alpha +1)=

Answer»

`( pi/4 - ALPHA/2) COSEC alpha`
`( pi/4 + alpha/2) cosec alpha`
`( pi/4 + alpha/2) SEC alpha`
`( pi/4 - alpha/2) sec alpha`

ANSWER :D


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