quite rusty... Would anyone help with the following, please: lim_{c_pi/2}[(X+tanC)/(1-XtanC)] =? I don't understand why, in a book, they continue thus: lim_{c_pi/2}[sec^{2}C/(-Xsec^{2}C] = -1/X Thank you in advance .
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Your book is using L'Hôpital's rule, which essentially states that if given: and: or then: Do you see that if you write the limit you are given as: you have the second indeterminate form above ?
Thank you, Mark. the The indetermination was readily obvious to me. My confusion relates to the transition into the sec^2 expressions. Would you please comment on that? Thanks.
They are a result of: .
Of course! Thank you very much, Mark!
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