The Total solution for NCERT class 6-12
(1 тАУ cos2┬аA)cosec2┬аA = 1L.H.S. = (1 тАУ cos2┬аA) cosec2┬аA = sin2┬аAcosec2┬аA┬а (тИ╡ 1 тАУ cos2┬аA = sin2┬аA)= (sin A cosec A)2┬а= (l)2┬а= 1 = R.H.S.┬а{sin A cosec A = 1 }