secx=1/cosxcscx=1/sinxcos0=1 sec0=1cos30=√3/2 sec30=2√3/3cos45=√2/2 sec45=√2cos60=1/2 sec60=2cos90=0 sec90无意义sin0=0 csc0无意义sin30=1/2 csc30=2sin45=√2/2 csc45=√2sin60=√3/2 csc60=2√3/3sin90...