This site is amazing for calculating all kinds of math problems.
www.wolframalpha.com
For example, try entering:
lim as x -> – infinity [e^x + e^(-x)]/[e^x - e^(-x)]
Wolfram Alpha
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This site is amazing for calculating all kinds of math problems.
For example, try entering:
lim as x -> – infinity [e^x + e^(-x)]/[e^x - e^(-x)]