Recent content by nta

  1. N

    Undergrad What is the 50th derivative of F(x)=Cos(2x)?

    change to cosine function I think you should use this way to solve your problem: 1th dx/dy = -2sin2x=+2cos(2x+pi/2), so we obtain 2th dx/dy = +4cos(2x+pi) 3th dx/dy = +8cos(2x+3pi/2) Continueing, we obtain: i th dx/dy=+2^icos(2x+npi/2), from this, we can determine 50th dx/dy very fast and easy