Related Post: Cos^-1(4/5)+tan^-1(2/3) Sin(cos^-1(4/5) + Tan^-1(2/3)) Alpha=cos^(-1)((4)/(5)) Beta=tan^(-1)((2)/(3)) 0 (iii) Cos 2 Tan^(-1)(1)/(4)+tan^(-1)(2)/(9) =(3)/(5) How To Find Sin Cos Tan Calculator