sin/cos^2a+cos/sin^2a最小值
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sin/cos^2a+cos/sin^2a最小值
sin/cos^2a+cos/sin^2a最小值
sin/cos^2a+cos/sin^2a最小值
sin/cos^2a+cos/sin^2a
=2sina/2/cosa/2+2cosa/2/sina/2
=2(sin^2a+cos^2a)/cosa/2sina/2
=2/cosa/2sina/2
=4/sina
sina最小值是-1
sin/cos^2a+cos/sin^2a最值是-4
sin/cos^2a+cos/sin^2a最小值
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