- How many cycles of a 40 MHz sine wave occur in 0.2 ms?

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What are alternative ways to look at a solar eclipse? PHone camera, etc? Can somebody please help me with the integral of (sin(x) - cos(x))/(sin(x)+cos(x)).
Thanks? A round table has 8 chairs around it. How many ways can 8 people be seated
around the table? Is it safe to watch the lunar eclipse by using a mirror? When was the last time their was a partial eclipse in Indiana?