1.

(d)/(dx ) {log ((sqrt(x +a ) + sqrt(x -a ))/(sqrt(x -b) - sqrt( x -c)))}=

Answer»

`1/2{(1)/(sqrt(X ^(2) - a ^(2)))+ (1)/(sqrt((x -b) (x -C )))}`
`{(1)/(sqrt(x ^(2) -a ^(2)))+ (1 )/((x -b))}`
`{(1)/(sqrt(x ^(2) - a ^(2)))- (1)/(sqrt((x -b) (x -c )))}`
`1/2 { (1)/(sqrt(x ^(2) - a ^(2)))- (1)/(sqrt((x -b)(x -c)))}`

Answer :A


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