Mathematics, 29.06.2019 10:50, pashon35

Prove that cos 3a = cos (2a+a)cos 3a = 4 cos³a – where from the cos a sin a * cos a give cos a? ? cos 3a = cos (2a +a)cos 2a cos a - sin2a sina(2cos²a-1)cosa-(2sina cos a) sina 2cos³a - cos a - 2 sin²a cos a2 cos³a-cos a - 2(1-cos²a)cos a2 cos³a - cos a - 2cos a + 2 cos³acos3a = 4cos³a-3cos a

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Prove that cos 3a = cos (2a+a)cos 3a = 4 cos³a – where from the cos a sin a * cos a give cos a? ?...

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