If sinx=4/5 what is cos (90-x)

sin (x) = ⁴/₅

sin⁻¹[sin (x) ] = sin⁻¹ (⁴/₅)

x ≈ 53.13

cos (90 - x) = cos (90) cos (x) + sin (90) sin (x)

cos (90 - 53.13) = cos (90) cos (53.13) + sin (90) sin (53.13)

cos (36.87) = 0cos (53.13) + sin (53.13)

cos (36.87) = sin (53.13)

cos (36.87) = cos (90 - 53.13)

cos (36.87) = cos (36.87)