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Question 4.2.4: Using Even and Odd Functions to Find Values of Trigonometric...

Using Even and Odd Functions to Find Values of Trigonometric Functions

Find the value of each trigonometric function:

a. \cos \left(-\frac{\pi}{4}\right)                b. \tan \left(-\frac{\pi}{4}\right).

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a. \cos \left(-\frac{\pi}{4}\right)=\cos \frac{\pi}{4}=\frac{\sqrt{2}}{2}                    b. \tan \left(-\frac{\pi}{4}\right)=-\tan \frac{\pi}{4}=-1

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