求答案求大神要详细过程………

2024-12-27 09:29:54
推荐回答(3个)
回答1:

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

回答2:

(cos10-√3sin10)/sin10cos10=2*2(sin30cos10-cos30sin10)/sin20=4sin20/sin20=4

回答3:

-1