Mark M. answered 12/27/18
Tutor
4.9
(953)
Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
The given limit has the form 0/0.
By L'Hopital's Rule, the given limit is equivalent to:
limx→0[5sec2(5x) / (cosx)] = 5(1) / (1) = 5