楼主: nyy
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[提问] cos^2A+cos^2B+cos^2C+2cosAcosBcosC=1→±A±B±C=? |
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毋因群疑而阻独见 毋任己意而废人言
毋私小惠而伤大体 毋借公论以快私情 |
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点评
一直都没想到这个简单的办法!
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毋因群疑而阻独见 毋任己意而废人言
毋私小惠而伤大体 毋借公论以快私情 |
||
| ||
毋因群疑而阻独见 毋任己意而废人言
毋私小惠而伤大体 毋借公论以快私情 |
||
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