What does LIM (x → 0) tan3x / X equal?
We know,
lim(X→0)[tanX/X] = 1
When x → 0, 3x → 0
So LIM (x → 0) [Tan 3x / 3x]
therefore
lim(X→0)tan3X/X=3{lim(X→0)[tan3X/3X]}=3*1=3
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