- Verify (1 - Sinx ) / ( Cosx (1-Sinx) ) = 1/Cosx?

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I got this ? Convert 2.22 x 1020 molecules of CCl4 to moles. I devided 2.22 by avogadro's # and got 0.36x10^6. Is that right? How light does not leave an optical fiber when the fiber is bent into an arc? If a and b are positive integers such that a^3/b^2=5/16, find the sum of all possible values of a that are less than 150.? Is it possible to fuel a rocket or Space probe using nuclear fuel? Why is a solar eclipse dangerous on the eyes?