Solve the trigonometric equation $\sin(x - \frac{\pi}{6}) = -\frac{\sqrt{2}}{2}$ for $x$.

TrigonometryTrigonometric EquationsSine FunctionAngles
2025/5/29

1. Problem Description

Solve the trigonometric equation sin(xπ6)=22\sin(x - \frac{\pi}{6}) = -\frac{\sqrt{2}}{2} for xx.

2. Solution Steps

We want to find the values of xx that satisfy the equation sin(xπ6)=22\sin(x - \frac{\pi}{6}) = -\frac{\sqrt{2}}{2}.
First, we find the angles whose sine is 22-\frac{\sqrt{2}}{2}. We know that sin(5π4)=22\sin(\frac{5\pi}{4}) = -\frac{\sqrt{2}}{2} and sin(7π4)=22\sin(\frac{7\pi}{4}) = -\frac{\sqrt{2}}{2}.
Therefore, the general solutions for the sine function are given by:
xπ6=5π4+2nπx - \frac{\pi}{6} = \frac{5\pi}{4} + 2n\pi
xπ6=7π4+2nπx - \frac{\pi}{6} = \frac{7\pi}{4} + 2n\pi
where nn is an integer.
Now, we solve for xx in each case:
Case 1: xπ6=5π4+2nπx - \frac{\pi}{6} = \frac{5\pi}{4} + 2n\pi
x=5π4+π6+2nπx = \frac{5\pi}{4} + \frac{\pi}{6} + 2n\pi
x=15π+2π12+2nπx = \frac{15\pi + 2\pi}{12} + 2n\pi
x=17π12+2nπx = \frac{17\pi}{12} + 2n\pi
Case 2: xπ6=7π4+2nπx - \frac{\pi}{6} = \frac{7\pi}{4} + 2n\pi
x=7π4+π6+2nπx = \frac{7\pi}{4} + \frac{\pi}{6} + 2n\pi
x=21π+2π12+2nπx = \frac{21\pi + 2\pi}{12} + 2n\pi
x=23π12+2nπx = \frac{23\pi}{12} + 2n\pi
The solutions are x=17π12+2nπx = \frac{17\pi}{12} + 2n\pi and x=23π12+2nπx = \frac{23\pi}{12} + 2n\pi, where nn is an integer.

3. Final Answer

x=17π12+2nπ,23π12+2nπx = \frac{17\pi}{12} + 2n\pi, \frac{23\pi}{12} + 2n\pi

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