曲英杰
春芽
共回答了14个问题采纳率:78.6% 举报
cosx=1/2,x=π/3,x=5π/3,x=2π+π/3=7π/3,x=2π+5π/3=11π/3
sinx=√2/2,x=π/4,x=3π/4,x=2π+π/4=9π/4,x=2π+3π/4=11π/4
9cosx=-9/2,cosx=-1/2,x=2π/3,x=4π/3,x=2π+2π/3=8π/3,x=2π+4π/3=10π/3
1年前
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vicro
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太感谢了,前面都对了~最后一个问题~请问这个怎么做? 9sinx= - 9/2
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曲英杰
sinx=-1/2,x=7π/6,x=11π/6,x=2π+7π/6=19π/6,x=2π+11π/6=23π/6