## Limits problem

Solve:
lim x->0 (tan 3(x+h)-tan(3x))/h

i hv no clue where to start =(
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 Blog Entries: 14 err.. tan (3h)/h? simply plugging in 0 for x.. edit: are you sure x is approaching 0? initially, I thought it's h.. then the answer would have been 3+3tan(3x)^2 and you had to do some mess with identites.. http://www.clarku.edu/~djoyce/trig/identities.html
 Recognitions: Homework Help Science Advisor Did you mean lim h->0??

## Limits problem

 Quote by Dick Did you mean lim h->0??
sry, yes i mean lim h->0
 Recognitions: Homework Help Science Advisor Look up a formula for tan(A+B) and apply it to tan(3x+3h). Then simplify, take your limit and use some trig.
 Blog Entries: 14 It is actually very simple.. don't even need to any trig after simplifying tan(3x+3h) .. should factor out things.. and they would cancel out nicely. And, one more thing tan(x)/x = 1 .. (which is simple to prove is you know sin(x)/x =1 as x-->0)

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