Question: is cosine negative in quadrant 2?
Answer: For an angle in the second quadrant the point P has negative x coordinate and positive y coordinate. Therefore: In Quadrant II, cos(θ) < 0, sin(θ) > 0 and tan(θ) < 0 (Sine positive). ... The quadrants in which cosine, sine and tangent are positive are often remembered using a favorite mnemonic.