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Question: How to eliminate _Z from solve result of trig problem?

Question:How to eliminate _Z from solve result of trig problem?

kms 5
solve simplify
February 09 2011
1

thanks, this worked for me. As for the

eqn1 := u = V * cos(a) * cos(b);

eqn2 := v = V*sin(b);

eqn3 := w = V*sin(a)*cos(b);

res:=solve({eqn1, eqn2, eqn3}, {V,a,b});

map(sin, res[3]);

simplify(%);

gives sin(b) = v / ( RootOf( _Z^2 - v^2 - w^2 - u^2);

map(x->x^2, %);

simplify(%);

gives

sin(b)^2 = v^2 / (v^2 + w^2 + u^2), which has no _Z , but is not right. is there a better way to eliminate _Z ?
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