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Chisinau MO p48 1949-56 VIII-IX sin^3 a+cos^3 a =? if sina+cosa = m

Source:

March 15, 2021
trigonometryalgebra

Problem Statement

Calculate sin⁡3a+cos⁡3a\sin^3 a + \cos^3 a if you know that sin⁡a+cos⁡a=m\sin a+ \cos a = m.
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