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CEL is offline
Oct30-07, 10:56 AM
P: 639
Quote Quote by SaRCaZZM View Post
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.