Try to use the fundamental trigonometric limit and its consequences when it comes to calculate the limit for the tangent.
Here is the problem.
lim as x approaches 0 of (tan4x/sin2x)
So far I have done this.
(sin7x/cos7x)/(sin2x)
(sin7x/cos7x) multiplied by (1/sin2x)
I'm not sure where to go from here. Suggestions? Thanks.
juventinoalex