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Question
Answer the following:
State the quadrant in which θ lies if sin θ < 0 and cos θ < 0
Solution
sin θ < 0
sin θ is negative in 3rd and 4th quadrants.
cos θ < 0
cos θ is negative in 2nd and 3rd quadrants.
∴ θ lies in the 3rd quadrant.
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