б) сos (2α)-cos²(α)/1-cos²(α)
cos(α)²-sin(α)²-cos (α)²/sin (α)²
-sin(α)²/sin(α)²
-1
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б) сos (2α)-cos²(α)/1-cos²(α)
cos(α)²-sin(α)²-cos (α)²/sin (α)²
-sin(α)²/sin(α)²
-1