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Please explain to me how to get this -- what quadrant tan theta < 0, sin theta < 0 is in.

  • trig -

    tan theta is negative. Which means either
    sinT is -, or cosT is neg, but not both.
    sinT is - when quadrant III, IV
    cosT is - in II, III

    so answer is IV where sin is -, cos is not -

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