答案是 4.1/sin10-根号3/cos10=2cos10/(2sin10cos10)-(2倍的根号3乘以sin10)/(2sin10cos10)=4*(sin30cos10-sin10cos30) / sin20=4
(cos10-√3sin10)/sin10cos10=2*2(sin30cos10-cos30sin10)/sin20=4sin20/sin20=4
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