Let’s work through another example of this type of system together. Solve the system algebraically: {y=2x+2y=x2+4x+3

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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.

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Icant see the triangle to answer your question