Question

Use a cofunction to write an expression equal to cos\frac{ 2pi }{ 7 }

Answer 1

\[\cos\frac{ 2\pi }{ 7 } \]

Answer 2

\(\large \cos \frac{2\pi}{7}=\sin (\frac{\pi}{2} -\frac{2\pi}{7})\)

Answer 3

thank you