# Math Help - Find the limit as f(x) approaches 0

1. ## Find the limit as f(x) approaches 0

lim as x --> 0

$[sin^2 (2x)]/x^2$

2. Use L'hospital rule

3. Originally Posted by roshanhero
Use L'hospital rule
i know the answer is 4 but i don't know how to get there...or how to use that rule

4. Can u differentiate sin^2(x) and x^2

5. Originally Posted by roshanhero
Can u differentiate sin^2(x) and x^2
actually no i get it now.

i have to multiply top and bottom by 2. that results in a special limit for sin.

(2sin2x/2x)^2
=(2)^2
=4

6. yeap.............