Evaluate, sin(4 – 3i) O 10.04240.68° 10.04Z – 139.32° O 9.71Z – 137.52° 10.04Z139.32°

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A: Given that: cos(67.5°)

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A: Tan(3B-20°)=Cot(2B+15°)

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Q: Find the exact value of cos 112.5°.

A: cos112.5°