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What is the Trigonometric ratio of cos180?
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What is the Trigonometric ratio of cos180?

User Tanieka
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\cos 180^(\circ)\\\\=\cos(2 \cdot 90^(\circ))\\\\=2 \cos^2 90^(\circ)-1\\\\=2 \cdot 0 - 1\\\\=0-1\\\\=-1

User Katapofatico
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