sin2a=2sina,
2sinacosa=2sina
2sina(cosa-1)=0
sina=0或cosa=1
即
a=kπ,或a=2kπ+π/2
cos2a=2cosa,
2cos²a-1=2cosa
2cos²a-2cosa-1=0
cosa=(2±√12)/2
即
cosa=1±√3
取cosa=1-√3
tan2a=2tana
2tana/(1-tan²a)=2tana
1. tana=0
a=kπ
2.tana≠0
1-tan²a=1
tan²a=0
还是tana=0
即tana=0
a=kπ
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