1. The problem statement, all variables and given/known data
1. Calculate lim x->0 (xtanx/cos(2x)-1) without using L'Hospitals rule.
2. Relevant equations
I am told that lim x->0 (sinx/x)=1
3. The attempt at a solution
If I substitute 0 in it gets 0/0. I have tried several trig identities without luck.
1. Calculate lim x->0 (xtanx/cos(2x)-1) without using L'Hospitals rule.
2. Relevant equations
I am told that lim x->0 (sinx/x)=1
3. The attempt at a solution
If I substitute 0 in it gets 0/0. I have tried several trig identities without luck.
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