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If sin θ=4/5 and 90°<θ<180°, what is cos θ?
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If sin θ=4/5 and 90°<θ<180°, what is cos θ?

User DoctorG
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1 Answer

6 votes

Answer:

Cos ∅ = 3/5

BUT COSINE IS NEGATIVE IN THE SECOND QUADRANT.

Thus cos∅= -3/5

User Xaver
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