W ( 2 ) = \frac { 1 } { 2 } \sin ( 0,4 \pi \cdot 2 )
Solve for W
W=\frac{\sqrt{10-2\sqrt{5}}}{16}\approx 0.146946313
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W\times 2=\frac{1}{2}\sin(0,8\pi )
Multiply 0,4 and 2 to get 0,8.
2W=\frac{\sin(\frac{4\pi }{5})}{2}
The equation is in standard form.
\frac{2W}{2}=\frac{\sqrt[4]{5}\sqrt{2\sqrt{5}-2}}{2\times 8}
Divide both sides by 2.
W=\frac{\sqrt[4]{5}\sqrt{2\sqrt{5}-2}}{2\times 8}
Dividing by 2 undoes the multiplication by 2.
W=\frac{\sqrt[4]{5}\sqrt{2\sqrt{5}-2}}{16}
Divide \frac{\sqrt[4]{5}\sqrt{2\sqrt{5}-2}}{8} by 2.
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