cos^-1=?,sin^-1=?,tan^-1=? - Yahoo!知識+
i dun know what you want to ask , but i can tell you sin^-1 x not equal to (sinx)-1 = cscx we call sin^-1 as arc sin , which is the inverse function of sin. for example , sin@ =k then @ = sin^-1 k . Similarly , we call cos^-1 x and tan^-1 x as arccos and ...