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olesik300899
@olesik300899
July 2022
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Тригонометрия. 10 класс.
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oganesbagoyan
Verified answer
sinα/(cosα -cos3α)
=sinα/2sin(3α-α)/2 *sin(α+3α)/2 =
sinα/2sinα *sin2α
=1/2sin2α
.
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Answers & Comments
Verified answer
sinα/(cosα -cos3α) =sinα/2sin(3α-α)/2 *sin(α+3α)/2 =sinα/2sinα *sin2α =1/2sin2α .