Problem

Use the fact that the trigonometric functions are periodic to find the exact value of the given expression. Do not use a calculator. \[ \sin \frac{37 \pi}{6} \] \[ \sin \frac{37 \pi}{6}=\square \] (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

Solution

Step 1 :\(\sin(x + 2\pi) = \sin(x)\) for any real number \(x\)

Step 2 :\(\frac{37\pi}{6}\) is greater than \(2\pi\), so we subtract \(2\pi\) from it

Step 3 :\(2\pi = \frac{12\pi}{6}\), so we subtract multiples of \(\frac{12\pi}{6}\) from \(\frac{37\pi}{6}\) until we get a fraction that is less than \(\frac{12\pi}{6}\)

Step 4 :\(\frac{37\pi}{6} - 3*\frac{12\pi}{6} = \frac{37\pi}{6} - \frac{36\pi}{6} = \frac{\pi}{6}\)

Step 5 :\(\sin\frac{37\pi}{6} = \sin\frac{\pi}{6}\)

Step 6 :\(\sin\frac{\pi}{6} = \frac{1}{2}\)

Step 7 :\(\sin\frac{37\pi}{6} = \frac{1}{2}\)

Step 8 :\(\boxed{\sin\frac{37\pi}{6} = \frac{1}{2}}\)

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Source: https://solvelyapp.com/problems/dfz3GF1fBl/

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