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cosπ7. cos3π7. cos5π7 are the roots of the equation 8x3−4x2−4x+1=0. Then the value of secπ7+sec3π7+sec5π7 is |
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Answer» cosπ7. cos3π7. cos5π7 are the roots of the equation 8x3−4x2−4x+1=0. Then the value of secπ7+sec3π7+sec5π7 is |
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