If sin-1 2a/1+a2- cos-11-b2/1+b2= tan-12x/1-x2 then prove that x = a-b/1+ab. plse reply fast Share with your friends Share 5 Priyanka Kedia answered this Refer the link: https://www.meritnation.com/ask-answer/question/ifsin-12a-1-a2-cos-11-b2-1-b2-tan-12x-1-x2-then-prove-tha/inverse-trigonometric-functions/9136053 2 View Full Answer Kartik Goel answered this sin-1 2a/1+a^2 = 2 tan-1 a (property) similarly for cos and tan. it becomes tan-1 a -tan-1b = tan-1 x use property 11