Chart with the sine, cosine, tangent value for each degree in the first quadrant Negative: cos, tan, The Unit Circle sec, cot 2Tt 900 Tt 3Tt 2 2700 Positive: sin, cos, tan, sec, csc, cot Negative: none 600 450 300 2 2 1500 1800 21 (-43, 1200 1350 2Tt 3600 300 1 ITC 3150 2250 2400 2 2) Positive: tan, cot 3000 2 Positive: cos, sec Negative: sin, tan, csc, cot com -1 2 Negative: sin, cos, sec, csc EmbeddedMath. Interactive Unit Circle. Sine, Cosine and Tangent in a Circle or on a Graph.. Sine, Cosine and Tangent. Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle:. For a given angle θ each ratio stays the same no matter how big or small the triangle is