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When is th ebest time to use it and what are some good rules of thumb for it?
Yeah. At least for me, that has come up a lot in dealing with arc-length.TD said:Instead of the tangent-secans relation, you can also use the fact that [itex]\cosh ^2 x - \sinh ^2 x = 1[/itex]. (cp the law with sin and cos, but here with a - instead of a +)
Yeah, but that wouldn't be a trig substitution, would it!TD said:Instead of the tangent-secans relation, you can also use the fact that [itex]\cosh ^2 x - \sinh ^2 x = 1[/itex]. (cp the law with sin and cos, but here with a - instead of a +)