(сosx/sinx-sinx/cosx)*sin2x=(cos²x-sin²x)/sinxcosx *2sinxcosx=2cos2x
-----------------------------------sin2x=2sinxcosx
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(сosx/sinx-sinx/cosx)*sin2x=(cos²x-sin²x)/sinxcosx *2sinxcosx=2cos2x
-----------------------------------sin2x=2sinxcosx