Question
Find the exact value of the cosine and sine of the given angle.$$\theta=\frac{5 \pi}{4}$$
Step 1
The angle $\pi$ is equivalent to $4 \pi/4$. Since $\frac{5 \pi}{4}$ is $\pi/4$ more than $\pi$, it lies in the third quadrant of the unit circle. Show more…
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