sin(60) = \frac{\sqrt{3}}{2}
tan(90) is undefined because cos(90) = 0, and tan(x) = \frac{sin(x)}{cos(x)}.
Now, let's look at the limit part: lim 0-0 0. This is not a standard notation for limits. However, if we assume it means the limit as x approaches 0, then
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