sin(3x – 20°)= cos (3y + 20°)⇒ sin (3x – 20°)= sin(90° – 3y – 20°)= sin(70° – 3y)⇒ 3x – 20° = 70° – 3y⇒ 3x + 3y = 90°⇒ 3(x + y) = 90°⇒ x + y = 30°
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