Sec inverse (x-3/x+3) + sin inverse (x+3/x-3) Share with your friends Share 0 Shilpa Patel answered this 2 View Full Answer A Pal answered this obviously , sec^(-1) [anything] is equal to cos^(-1)[1/anything]. Here anything is [{x-3}/{x+3}]. Now , as sin^(-1)[something] + cos^(-1)[something] is pi/2. hence answer is pi/2. 0