MATH 0240 Midterm: MATH 240 trigReview-29
Document Summary
Trigonometry is a very useful and important subject. In this short introduction we will only discuss its very basic aspects: angles between 0 and /2. For any angle from 0 to /2 one can form a right triangle as below. Then the six standard trigonometric functions of are de ned as follows: sin = cos = tan = Ab opposite hypothenuse adjacent hypothenuse opposite adjacent sec = csc = cot = The two most important and most common in practice right triangles are the following two: For any real number one can de ne the trigonometric functions of. Using the unit circle as in the picture below. We start at the point (1, 0) and then go around the unit circle by. In the counterclockwise direction (if < 0, we go clockwise by ). We end up at the point p .
