你好!
题目有点问题吧
应该是
(secx) ^-1 = (1 / cosx ) ^-1
(cscx) ^-1 = ( 1 / sinx ) ^-1
因为 secx = 1/cosx ,cscx = 1/sinx
所以显然成立.
sec^-1 (x) = cos^-1(1/x),csc^-1(x)=sin^-1(1/x)
2个回答
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