cosα/sinα/2 - cosα/2 = (cosα - 1/2 · 2 · cosα/2sinα/2) : sinα/2 = (cosα - 0,5sinα) : sinα/2
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cosα/sinα/2 - cosα/2 = (cosα - 1/2 · 2 · cosα/2sinα/2) : sinα/2 = (cosα - 0,5sinα) : sinα/2