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A= 2x+ y
B = x + 3y
sin(A+B) = sinA cos B + cos A sin B
sin (A+B) = sin (2x+y) cos (x+3y) + cos(2x+y) sin (x+ 3y)
2) cos 225 = cos (180 + 45) = - cos 45 = - ¹/₂√ 2
3). sin 135 = sin (180 - 45) = sin 45 = ¹/₂ √2