y⁾=(ln(2x²-1))⁾ = 1/(2x²-1) * (2x²-1)⁾ = 1/(2x²-1) *4x =4x/(2x²-1)
y⁾=(ln(x+1)/(x-1) )⁾= ( (ln(x+1)⁾*(x-1) - (x-1)⁾* (ln(x+1) ) / (x-1)²=
( 1/(x+1)) *(x-1) - 1* (ln(x+1) ((x-1)/(x+1)) - (ln(x+1)
= ------------------------------------- = ----------------------------------
(x-1)² (x-1)²
y⁾=(2^√x) = ln2*(2^√x)/ (2√x)
y⁾=( 3^lnx)⁾= (ln3*3^lnx)/x