Question

Find the limit. Use l'Hospital's Rule if appropriate.

lim x→π/4 10(tanx)tan(2x)

Answer 1

\[doesn't\ exist\ since:\ \lim_{x->\frac{ \pi }{ 4 } -} \neq \lim_{x->\frac{ \pi }{ 4 } +}\]

l'hopital's doesnt apply

Answer 2

@euler271 the limit does exist, the answer was 10/e

Answer 3

i don't agree :P

where did you see that answer?

if you literally plug in -pi/4 you get -infty.
+pi/4 and you get +infinity