2cos2x+sin^2x 化简

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2cos2x+sin^2x化简2cos2x+sin^2x化简2cos2x+sin^2x化简2cos2x+sin^2x=2(cos^2x-sin^2x)+sin^2x=2cos^2x-sin^2x=3c

2cos2x+sin^2x 化简
2cos2x+sin^2x 化简

2cos2x+sin^2x 化简
2cos2x+sin^2x
=2(cos^2x-sin^2x)+sin^2x
=2cos^2x-sin^2x
=3cos^2x-1

2cos2x+sin^2x=2(2cos^2x-1)+sin^2x=4cos^2x-2+sin^2x=3cos^2x+cos^2x+sin^2x-2=3cos^2x+1-2=3cos^2x-1