cos^2(π/2-x)≠1怎么解啊
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cos^2(π/2-x)≠1怎么解啊cos^2(π/2-x)≠1怎么解啊cos^2(π/2-x)≠1怎么解啊cos²(π/2-x)≠1sin²x≠1sinx≠1且sinx≠-1x≠
cos^2(π/2-x)≠1怎么解啊
cos^2(π/2-x)≠1怎么解啊
cos^2(π/2-x)≠1怎么解啊
cos²(π/2 -x)≠1
sin²x≠1
sinx≠1且sinx≠-1
x≠2kπ±π/2 (k∈Z).