Sin^2x=cos^2x-1/2
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Sin^2x=cos^2x-1/2Sin^2x=cos^2x-1/2Sin^2x=cos^2x-1/20≤sin²x≤1/40≤cos²x-1/2≤1/4我认为你接下来的应该会算
Sin^2x=cos^2x-1/2
Sin^2x=cos^2x-1/2
Sin^2x=cos^2x-1/2
0≤sin²x≤1/4
0≤cos²x-1/2≤1/4
我认为你接下来的应该会算
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