Mathematics, 05.11.2020 01:00, londonval

Which statement illustrates why cosine is an even function? cos(pie/4) = -cos(5pie/4)
cos(pie/4) = -cos(4pie/4) cos(-pie/4) = cos(pie/4)
cos(-7pie/6) = cos(5pie/4)

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Which statement illustrates why cosine is an even function? cos(pie/4) = -cos(5pie/4)
cos(pie...