Prove that cosπ15cos2π15cos3π15cos4π15cos5π15cos6π15cos7π15=1128 .

Prove that $\cos \frac{π}{15} \cos \frac{2 π}{15} \cos \frac{3 π}{15} \cos \frac{4 π}{15} \cos \frac{5 π}{15} \cos \frac{6 π}{15} \cos \frac{7 π}{15} = \frac{1}{128}$ .

Matching exercise

Match the items on the right to the items on the left.

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