Good morning, I use Mathematica for a few days (it's a gift from my wife for my birthday) and I find it fantastic. Today, however, I am in great difficulty because I can no longer run the program. I write Sin [x] = a / sqrt (a ^ 2 + b ^ 2) and Cos [x] = b / sqrt [a ^ 2 + b ^ 2] ... Now if I write Tan [4x] I should get the result in function of a and b .. I managed to do this only once .. Thanks to those who can help me .. I am retired and I do not know anyone who can help me.
Emile
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