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- 1. TRIGONOMETRIC FUNCTIONS OF ANGLES<br />
- 2. QUADRANTS<br />The coordinate axes divide the plane into four parts called quadrants. For any given angle in standard position, the measurement boundaries for each quadrant are summarized as follows: <br />y<br />Quadrant I<br />Quadrant II<br />( +, + )<br />( -, + )<br />x<br />o<br />Quadrant IV<br />Quadrant III<br />( -, - )<br />( +, - )<br />
- 3. TRIGONOMETRIC FUNCTIONS OF ANY ANGLE <br />If is an angle in standard position, P(x, y) is any point other than the origin on the terminal side of , and <br /> , then <br />y<br />x<br />o<br />
- 4.
- 5. SIGNS OF THE TRIGONOMETRIC FUNCTIONS<br />Each of the trigonometric functions of an angle is given by two of the variables x, y and r associated with . Because r is always positive, the sign (+ or -) of a trigonometric function is determined by the signs of x and y, and therefore by the quadrant containing . <br />y<br />All Functions<br />x<br />o<br />
- 6. QUADRANTAL ANGLES<br />An angle in standard position whose terminal side lies onthe x or y-axis is called a quadrantal angle.The definitions of the trigonometric functions can be used to evaluate the trigonometric functions of the quadrantal angles 00, 900, 1800, 2700, and 3600 by using r equal to 1.<br />y<br />x<br />o<br />
- 7. REFERENCE ANGLE<br />The reference angle of any angle is the positive angle formed by the terminal side of the angle and the nearest x-axis. <br />A summary of how to calculate the reference angle from a given angle is given below:<br />Quadrant I :<br />Quadrant II :<br />Quadrant III :<br />Quadrant IV :<br />
- 8. EXAMPLE<br />1. Determine the quadrant where the terminal side of each angle lie when it is in standard position.<br />2. The terminal side of angle in standard position passes through P. Draw and find the exact values of the six trigonometric functions of . <br />3. Determine the sign of the following trigonometric functions without the aid of calculator.<br />
- 9. EXAMPLE<br />4. Find the exact values of the other five trigonometric functions for an angle in standard position lying in the given quadrant.<br />5. Give the measure of the reference angle for each of the angle in standard position.<br />6. Find the exact values of the six trigonometric functions for each of the following angle without the aid of calculator.<br />

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