- Calculate frequency of a photon with energy of 3.45 x 10-21?

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Should I take natural melatonin at night while I am still taking synthroid in the morning? Simplify:
cos x ∙ sec x =? The polynomial 5x^2-6x+8 is a trinomial? What else besides darpa and haarp or a.i. could have surveilance, for what purpose? Calculate the pH of a buffer made up of 1.0 M NH3 and 1.0 M NH4Cl. (Ka = 5.6 x 10-10)?