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4. a) What is the value of cos 30 ? What is the value of sin 60 ? b) Explain why cos 30 and

4. a) What is the value of cos 30 ? What is the value of sin 60 ? b) Explain why cos 30 and sin 60 are related in this way. (You may want to draw a triangle with these angles to help you.) c) Using this relationship, fill in the blanks in the chart below. sin 10 = cos sin = cos 40 sin x = cos

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