- #1

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## Homework Statement

1. Calculate lim x->0 (xtanx/cos(2x)-1) without using L'Hospitals rule.

## Homework Equations

I am told that lim x->0 (sinx/x)=1

## The Attempt at a Solution

If I substitute 0 in it gets 0/0. I have tried several trig identities without luck.