sina+cosa((0
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sina+cosa((0sina+cosa((0sina+cosa((0sina+cosa=√2(sina/√2+cosa/√2)=√2(sinacosπ/4+cosasinπ/4)=√2sin(a+
sina+cosa((0
sina+cosa((0
sina+cosa((0
sina+cosa=√2(sina/√2+cosa/√2)=√2(sinacosπ/4+cosasinπ/4)=√2sin(a+π/4)
sina+cosa((0
已知sina+cosa=0且cosa
设tanA= Sina-cosa / Sina+cosa且0
已知sinA+cosA=m求sinA-cosa(0°
已知,5sina+2cosa=0,求sina*cosa
已知12sina+5cosa=0,求sina,cosa
sina cosa+sina-cosa=0 求sin2a的值如题
sinA+cosA=tanA(0
cosa+sina=0.2,0
sinA+cosA=tanA(0
Sina+cosa=tana(0
sina+cosa=tana(0
若|cosa|/cosa+sina/|sina|=0,试判断sin(cosa)·cos(sina)的符号
( sina*sina-cosa*cosa)/cos2a*sina+cos2a*cosa)=0≤a≤π
已知sina+2cosa=0 求sina+cosa/sina-cosa
若sina+cosa=0,则cosa+2sina/2cosa-3sina的值为
若sina+cosa=0,则cosa+2sina/2cosa-3sina的值为
sina-cosa