S△PDE=xy/2=8tanα/(1+tanα+1/cosα)^2.中‘‘^’’是啥意思
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S△PDE=xy/2=8tanα/(1+tanα+1/cosα)^2.中‘‘^’’是啥意思
S△PDE=xy/2=8tanα/(1+tanα+1/cosα)^2.中‘‘^’’是啥意思
S△PDE=xy/2=8tanα/(1+tanα+1/cosα)^2.中‘‘^’’是啥意思
‘‘^’’说明后面的数字或字符在上角的位置
如a^2=a²