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Concept Check Without using a calculator, decide whether

Chapter 3, Problem 45

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QUESTION:

Concept Check Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that p 3.14.) cos 2

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QUESTION:

Concept Check Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that p 3.14.) cos 2

ANSWER:

Step 1 of 2

We have to determine whether the function value  is positive or negative without using the calculator.

We know that,

And

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