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P: 639
 Quote by SaRCaZZM 1. The problem statement, all variables and given/known data I need help solving for d, in the really long equation below. However, whenever I insert the following command (see below), I get 'is not a valid equation or expression', but I can't figure out why. 2. Relevant equations ((cot(104.789d))^2) + (((cot(104.789d))^2)*(1 + (-1.339*(10^-3)))*((sin(209.58d))^2))=-0.3939 3. The attempt at a solution solve('((cot(104.789d))^2) + (((cot(104.789d))^2)*(1 + (-1.339*(10^-3)))*((sin(209.58d))^2))=-0.3939','d')
I suppose that when you write cot(104.789d) you really mean cot(104.789*d). The same with the arguments of the other trigonometric functions.