已知sina=√2cosb,tana=√3cotb,-π/2

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已知sina=√2cosb,tana=√3cotb,-π/2已知sina=√2cosb,tana=√3cotb,-π/2已知sina=√2cosb,tana=√3cotb,-π/2sina=√2cos

已知sina=√2cosb,tana=√3cotb,-π/2
已知sina=√2cosb,tana=√3cotb,-π/2

已知sina=√2cosb,tana=√3cotb,-π/2
sina=√2cosb
sin²a=2cos²b
1-sin²a=1-2cos²b
cos²a=1-2cos²b
tana=√3cotb
sina/cosa-√3cosb/sinb=0
√2cosb/cosa-√3cosb/sinb)=0
cosb(√2/cosa-√3/sinb)=0
cosb=0或√2/cosa=√3/sinb
cosb=0,0