We need to evaluate the expression $\frac{\sin(\frac{2\pi}{3}) + \cos(\frac{\pi}{4})}{\sin(\frac{\pi}{6})}$.

TrigonometryTrigonometryTrigonometric FunctionsUnit CircleExpression Evaluation
2025/5/22

1. Problem Description

We need to evaluate the expression sin(2π3)+cos(π4)sin(π6)\frac{\sin(\frac{2\pi}{3}) + \cos(\frac{\pi}{4})}{\sin(\frac{\pi}{6})}.

2. Solution Steps

First, we need to find the values of sin(2π3)\sin(\frac{2\pi}{3}), cos(π4)\cos(\frac{\pi}{4}), and sin(π6)\sin(\frac{\pi}{6}).
sin(2π3)\sin(\frac{2\pi}{3}) can be found using the identity sin(πx)=sin(x)\sin(\pi - x) = \sin(x).
sin(2π3)=sin(ππ3)=sin(π3)=32\sin(\frac{2\pi}{3}) = \sin(\pi - \frac{\pi}{3}) = \sin(\frac{\pi}{3}) = \frac{\sqrt{3}}{2}.
cos(π4)\cos(\frac{\pi}{4}) is a standard value, and cos(π4)=22\cos(\frac{\pi}{4}) = \frac{\sqrt{2}}{2}.
sin(π6)\sin(\frac{\pi}{6}) is also a standard value, and sin(π6)=12\sin(\frac{\pi}{6}) = \frac{1}{2}.
Now we substitute these values into the expression:
sin(2π3)+cos(π4)sin(π6)=32+2212\frac{\sin(\frac{2\pi}{3}) + \cos(\frac{\pi}{4})}{\sin(\frac{\pi}{6})} = \frac{\frac{\sqrt{3}}{2} + \frac{\sqrt{2}}{2}}{\frac{1}{2}}
=3+2212= \frac{\frac{\sqrt{3} + \sqrt{2}}{2}}{\frac{1}{2}}
=3+2221= \frac{\sqrt{3} + \sqrt{2}}{2} \cdot \frac{2}{1}
=3+2= \sqrt{3} + \sqrt{2}

3. Final Answer

3+2\sqrt{3} + \sqrt{2}

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