Problem

Find the exact value of $\arctan \left(\tan \left(-\frac{\pi}{4}\right)\right)$
Write your answer in radians in terms of $\pi$.

Answer

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Answer

Since \(-1\) corresponds to an angle of \(-\frac{\pi}{4}\), the final answer is \(\boxed{-\frac{\pi}{4}}\)

Steps

Step 1 :We are given \(\tan\left(-\frac{\pi}{4}\right)\)

Step 2 :Using the periodicity of the tangent function, we can rewrite it as \(\tan\left(-\frac{\pi}{4} + \pi\right)\)

Step 3 :Simplifying the angle inside the tangent function, we have \(\tan\left(\frac{3\pi}{4}\right)\)

Step 4 :Using the property of the tangent function, we can express it as \(\frac{\sin\left(\frac{3\pi}{4}\right)}{\cos\left(\frac{3\pi}{4}\right)}\)

Step 5 :At \(\frac{3\pi}{4}\), the sine function is \(\frac{\sqrt{2}}{2}\) and the cosine function is \(-\frac{\sqrt{2}}{2}\)

Step 6 :Therefore, \(\tan\left(\frac{3\pi}{4}\right) = -1\)

Step 7 :Taking the inverse tangent of \(-1\), we get the exact value of \(\arctan\left(\tan\left(-\frac{\pi}{4}\right)\right)\)

Step 8 :Since \(-1\) corresponds to an angle of \(-\frac{\pi}{4}\), the final answer is \(\boxed{-\frac{\pi}{4}}\)

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