1.

Let α=cos2π7+cos4π7+cos6π7 and β=sin2π8+sin23π8+sin25π8+sin27π8. Then the value of αβ is

Answer»

Let α=cos2π7+cos4π7+cos6π7 and β=sin2π8+sin23π8+sin25π8+sin27π8. Then the value of αβ is



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