化简:270<a<360,化简√1-[2/(sin^2 a•tan a+cos^2 a•cot a+2sinacosa)]

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化简:270<a<360,化简√1-[2/(sin^2a•tana+cos^2a•cota+2sinacosa)]化简:270<a<360,化简√1-[2/(sin^2a

化简:270<a<360,化简√1-[2/(sin^2 a•tan a+cos^2 a•cot a+2sinacosa)]
化简:270<a<360,化简√1-[2/(sin^2 a•tan a+cos^2 a•cot a+2sinacosa)]

化简:270<a<360,化简√1-[2/(sin^2 a•tan a+cos^2 a•cot a+2sinacosa)]