1.

cosπ7. cos3π7. cos5π7 are the roots of the equation 8x3−4x2−4x+1=0. Then the value of sinπ14.sin3π14.sin5π14 is

Answer»

cosπ7. cos3π7. cos5π7 are the roots of the equation 8x34x24x+1=0. Then the value of sinπ14.sin3π14.sin5π14 is




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