Evaluate the limit using L'Hopital's rule
lim
x
→
π
2
5
cos
(
−
7
x
)
sec
(
5
x
)
\displaystyle \lim_{{{x}\rightarrow\frac{\pi}{{2}}}}\ {5}{\cos{{\left(-{7}{x}\right)}}}{\sec{{\left({5}{x}\right)}}}
x
→
2
π
lim
5
cos
(
−
7
x
)
sec
(
5
x
)
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity