Pythagorean Identities

[awibroe]

Hello All,

I have been working on an integration problem which I was stuck on in which I should have known the identity cos^2(x) = 1/2+cos(2x)/2.

I am wondering if there is a way maybe using mathcad's symbolics that I could have worked this out i.e. by Mathcad telling me sin^2(x) is an identity or to get Mathcad to list such identities?

Any thoughts?

Cheers,

Andy

[Werner_E · Accepted solution]

I would not call it Pythagorean Identities.

Mathcads primary goal is to simplify expressions (sometimes admittedly in a strange way), so I guess it will be hard to get Mathcad tell you what cos^2(x)=..

But it works the other way round.

There is a crude way to get what you want: