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Evaluate the indicated limit, if it exists. If it does not exist, explain why it doesn’t. Assume that lim x-> 0 sin x/x = 1

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it is a well known limit \[\lim_{x\to 0}\frac{\sin(x)}{x}=1\]
but the proof is not obvious look in any intro calculus book, it will be there using a geometric argument and the "squeeze theorem"
1) lim x-> 2 (x-5/x^2 + 4) 2) lim x-> 3 (x^2 - x - 6/x - 3) 3) lim h-> 0 ((2 + h)^2 - 4/h)

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Other answers:

1) replace \(x\) by 2
2) factor as \[\frac{(x-3)(x+2)}{x-3}=x+2\] then replace \(x\) by 3
3) expand get \[\frac{(2+h)^2-4}{h}=\frac{4+4h+h^2-4}{h}=\frac{4h+h^2}{h}=4+h\] then replace \(h\) by 0
for number 4) its this one lim t-> -2 (1/2 + 1/t over 2 + t)
and 5) lim x->4 + sqrt(16 - x^2)
\[\frac{1}{2}+\frac{1}{t}=\frac{t+2}{2t}\] divide by \(t+2\) and get \[\frac{1}{2t}\] replace \(t\) by \(-2\)
\[\lim_{x\to 4^+}\sqrt{16-x^2}\] does not exist because if \(x>4\) then \(16-x^2<0\) and you cannot take the square root of a negative number
okay thanks alot :)

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