[(cscx)^2 -1]/cotx
=(cotx)^2/cotx
=cotx
cscx/secx = (1/sinx)/(1/cosx) = cosx/sinx = cotx
=>
[(cscx)^2 -1]/cotx=cscx/secx
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[(cscx)^2 -1]/cotx
=(cotx)^2/cotx
=cotx
cscx/secx = (1/sinx)/(1/cosx) = cosx/sinx = cotx
=>
[(cscx)^2 -1]/cotx=cscx/secx
欢迎分享,转载请注明来源:内存溢出
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