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 Dear wolframalpha users, I am not able to write system of three equations with three unknown variables v1, v2 and v3 into the wolframalpha. Separate eguations works in wolfram but not together. equation 1: u*h*sin(2*alfa) = sqrt( (v2*u3-v3*u2)^2 + (v3*u1-v1*u3)^2 + (v1*u2-v2*u1)^2 )  equation 2: h*h*sin(2*alfa) = sqrt( (h2*v3-h3*v2)^2 + (h3*v1-h1*v3)^2 + (h1*v2-h2*v1)^2 )  equation 3: h^2 = v1^2 + v2^2 +v3^2  I have tried to write: u*h*sin(2*alfa) = sqrt( (v2*u3-v3*u2)^2 + (v3*u1-v1*u3)^2 + (v1*u2-v2*u1)^2 ), h*h*sin(2*alfa) = sqrt( (h2*v3-h3*v2)^2 + (h3*v1-h1*v3)^2 + (h1*v2-h2*v1)^2 ), h^2 = v1^2 + v2^2 +v3^2  But the wolfram answer was: Wolfram|Alpha doesn't understand your query Then I have tried this beta version site: http://www.wolframalpha.com/widgets/view.jsp?id=ae438682ce61743f90d4693c497621b7 But the answer was: Not a valid input; please try again Does anyone have any idea what is wrong? Yours faithfuly, Rene Labounek