Question

Lt y tends to 0
[(x+y) sec(x+y) -x.secx] /y

Answer 1

is it limit ?

Answer 2

yeah i believe he meant limit as y approaches 0

Answer 3

LOL, Ohh why do u use lt, @msingh ? it should use lim ....
well use L'hopital, just derive for numerator and the denominator

Answer 4

?

Answer 5

yes, its limit , t tends to 0

Answer 6

*y tends to 0

Answer 7

can u determine derivative of (x+y)sec(x+y) - xsecx ?

Answer 8

d/dy i meant, because the limit tends of y

Answer 9

assume all x's as constants

Answer 10

Just in case ...To clarify to msingh... L'hopital rule says that as lim approaches 0...if both the numerator and denominater ALSO equal 0...so 0/0...you can simply derive the numerator and denominator until you'll get the true limit