Inverse Trigonometric Functions (Inverse Trig Functions) Inverse trig functions: sin-1x , cos-1x , tan-1x etc. denote angles or real numbers whose sine is x , whose cosine is x and whose tangent is x, provided that the answers given are numerically smallest available. These are also written as arc sinx , arc cosx etc . If there are two angles one positive & the other … [Read more...]