Graph XY with endpoints X( -3,1) and Y(4, - 5) and its image after the composition. Rotation: 270° about the origin
Reflection: in the y-axis

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.