1. The problem statement, all variables and given/known data I was given an angle "X" with sinX=X and cosX=1. The question says that it is smaller than 1rad. Other data is irrelevant. 2. Relevant equations None. 3. The attempt at a solution In my point of view, this angle would be 0, because the only angle I know that sinOfAngle=valueOfAngle and cos=1 and at the same time smaller than 1rad. But the answer isn't 0, it's 0,03. Would someone try to explain this?