asin((-(-9.81)(180.27)/38.7^2). If your denominator is ((38.7)^2) =1,497.69, then:1,768.4487 / 1,497.69 =1.18, which is the "Sine" of your expression. And you cannot have sine greater than 1. It must be between -1 and +1. That is why you get the error message.
