Concept explainers
The values of six trigonometric functions using
Answer to Problem 18E
Explanation of Solution
Given:
The values of expressions,
Concept Used:
- Reciprocal identities of trigonometric functions:
- Quotient Identities:
- In Quadrant I, all trigonometric functions are positive.
- In Quadrant II, only sine and cosecant are positive.
- In Quadrant III, only tangent and cotangent are positive.
- In Quadrant IV, only cosine and secant are positive.
Calculation:
In order tofind the values of the six trigonometric functions, use the reciprocal and quotient identities of trigonometric functions.
Since secant (sec) is positive and tangent (tan) is negative, so the angle should be in Quadrant IV.
Since the angle is in fourth quadrant, so only cosine and secant will be positive, rest other trigonometric function will be negative.
So, using the reciprocal and quotient identities, it gives
Thus, the values of the six trigonometric function is given by,
Chapter 5 Solutions
Precalculus with Limits: A Graphing Approach
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