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 cos ( − 90 ° ) is evaluated as follows. The terminal side of an angle of degree measure − 90 passes through the point A ( 0 , − 1 ) on the unit circle as shown below in Figure 2

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ISBN: 9780135961407

Author: Barnett

Publisher: PEARSON CO

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Chapter 8.2, Problem 15E

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To find: The exact value of cos(−90°) without the use of a calculator.

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Chapter 8.2, Problem 14E

Chapter 8.2, Problem 16E

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The exact value of cos ( − 90 ° ) without the use of a calculator.

Solution Summary: The author evaluates the expression mathrmcos(-90°) without the use of a calculator.

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