Labels:text | screenshot | font | rectangle | number | display OCR: sum of two trignometric functions sin x + sin y = 2 sin - (x+ y) cos + (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) + 1; 2 sin (x + y) cos x cos y = 2 cos (x - y) + 12 cos (x + y) table of contents
