Question

Is the function tan t positive or negative in Quadrant IV?

Answer 1

tan = sin/cos

in quadrant IV, is sine positive or negative?

in quadrant IV, is cosine positive or negative?

Answer 2

Just remember all students take calculus 1 2 3 4 all are positive in first quad, sin is + in the 2nd, tan in the 3rd, and cosin in the forth ^_^