Labels:text | screenshot | font | rectangle | number | line | parallel OCR: sum of two trignometric functions sin x + sin y = 2 sin > (x +y) cos 1 (x-y) sin x - sin y = 2 cos 1 (x + y) sin 1 (x-y) product of two trignometric functions sin x sin y = > cos (x -y) - > cos (x +y) sin x cos y = > sin (x-y) ++ sin (x+y) cos x cos y = 2 cos (x - y) + 2 cos (x + y) table of contents
