sin 8a cos 2a - cos 8a sin 2a
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cos 2a cos 4a - sin 2a sin 4a
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cos 2a cos 4a - sin 2a sin 4a
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Ответ:
Объяснение:
=sin(8a-2a) / cos(2a+4a) =sin6a/cos6a =tg 6a