求证sin^4a+cos^4a=1
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求证sin^4a+cos^4a=1求证sin^4a+cos^4a=1求证sin^4a+cos^4a=1这个不恒等.只有sin^2a+cos^2a=1sin^4a+cos^4a+2(sinacosa)^
求证sin^4a+cos^4a=1
求证sin^4a+cos^4a=1
求证sin^4a+cos^4a=1
这个不恒等.只有sin^2 a+ cos^2 a=1 sin^4a +cos^4 a+2(sinacosa)^2=1 sin^4 a+ cos^4 a=1-sin^2(2a)/2
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