Question

разложите на множители cosa+cos2a+cos3a​

Answer 1

$cos( alpha ) + cos(2 alpha ) + cos(3 alpha ) \ \ cos( alpha ) + cos {}^{2} ( alpha ) + sin {}^{2} ( alpha ) + 4 cos {}^{3} ( alpha ) - 3 cos( alpha ) \ \ 4 cos {}^{3} ( alpha ) + cos {}^{2} ( alpha ) - 2 cos( alpha ) + sin {}^{2} ( alpha ) \ \ 2 cos( alpha ) times cos(2 alpha ) + 1$

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