Explanation Definition used: Let x be the radian measure of an angle in standard position, and let P = ( a , b ) be the point on the unit circle that lies on the terminal side of the angle in Figure 1. Then sin x = b and cos x = a . Calculation: The value of the given expression sin ( − 180 ° ) is evaluated as follows. The terminal side of an angle of degree measure − 180 passes through the point A ( − 1 , 0 ) on the unit circle as shown below in Figure 2

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.

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Chapter 8.2, Problem 16E

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Chapter 8.2, Problem 15E

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Chapter 8 Solutions

FIN 108 ISU LOOSE >IP<

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The exact value of sin ( − 180 ° ) without the use of a calculator.

Solution Summary: The author evaluates the expression mathrmsin(-180°) without the use of a calculator.

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