Cos 1 1 x 2 1 x 2 formula July 8, 2019 16 32 64 128 Cos inverse 1 x 2 1 x 2 formula The formula cos (- 1 )( 1 x 2 1 x 2 ))= 2tan (- 1 x holds only for Cos 1 cos 2 cos 3
