Mathematical differentials

short-cut to these items listed below:
general    goniometric    hyperbolic gonio   

General differentials        [top] no. Equation Remarks 1   2   3 a>0 4   5   Goniometric        [top] no. Equation Remarks 1   2   3 x/2 4 |x|<1 5 |x|<1 6   Hyperbolic goniometry        [top] no. Equation Remarks 1   2   3   4   5 x>1 6 |x|<1