РЕШИТЕ СРОЧНО ВЛОЖЕНИЕ. (УПРОСТИТЬ ВЫРАЖЕНИЕ)
=-2cosa+(sina/tga+1)^2-cos^2a=-2cosa+(cosa+1)^2-cos^2a=-2cosa+cos^2a+2cosa+1-cos^2a=1
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=-2cosa+(sina/tga+1)^2-cos^2a=-2cosa+(cosa+1)^2-cos^2a=-2cosa+cos^2a+2cosa+1-cos^2a=1