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P. 91
d 1
2
arctanh x = , x < 1
dx 1 − x 2
d Z x
f(ξ) dξ = f(x)
dx c
d Z c
f(ξ) dξ = −f(x)
dx x
d Z h Z h ∂f(ξ, x)
0
f(ξ, x) dξ = dξ + f(h, x)h − f(g, x)g 0
dx g g ∂x
87
