- Hi how to calculate laplace inverse (1/(s cosh(as))) thanks?

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I need a physics joke/pun for the next time I see my professor at lunch and just wanna say "hi".? If y= f(x)= 4x-7/2x-4 then prove that f(y) = x? S2-(aq)+H2O(l)<->SH-1(aq)+OH1-(aq) K=1.0 if initial concentration of sodium sulfide was 0.50 M what is OH- concentration at equilibrium? Can you take 20 mg of prednisone for three days? X^3+4x=4+x^2 simplify i got stuck?