证明sina+sinb-sinasinb+cosacosb=1
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证明sina+sinb-sinasinb+cosacosb=1证明sina+sinb-sinasinb+cosacosb=1证明sina+sinb-sinasinb+cosacosb=1证明:∵sin
证明sina+sinb-sinasinb+cosacosb=1
证明sina+sinb-sinasinb+cosacosb=1
证明sina+sinb-sinasinb+cosacosb=1
证明:∵sina+sinb-sinasinb+cosacosb =sina+sinb·(1-sina)+cosa·cosb =sina+sinb·cosa+cosa·cosb =sina+cosa·(sinb+cosb) =sina+cosa =1 ∴sina+sinb-sinasinb+cosacosb=1
sina+sinb-sinasinb+cosacosb =sina(1-sinb)+sinb+cosacosb =sinacosb+cosacosb+sinb =cosb(sina+cosa)+sinb =cosb+sinb =1 希望我的答案可以帮助到你!
证明sina+sinb-sinasinb+cosacosb=1
化简sina+sinb-sinasinb+cosacosb化简sina+sinb-sina·sinb+cosa·cosb
证明|sina-sinb|
证明 |sinA-sinB|=
SinA*SinB公式证明
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sina^2+sinb^2+1/4=sinasinb+1/2(sina+sinb)
已知:1+cosa-sinb+sinasinb=0,1-cosa-cosb+sinasinb=0,sina=?
在三角形ABC中,已知(sinA+sinB+sinC)(sinA+sinB-sinC)=3sinAsinB,求角C的度数
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在三角形ABC中,若(sinA+sinB+sinC)(sinA+sinB-sinC)=sinAsinB,求角C的度数急!谢谢!
已知A,B满足1+cosA-sinB+sinAsinB=0,1-cosA-cosB+sinAsinB=0,则sinA的值?
证明sina平方+sinb平方+1≥sina+sinb+sina*sinb
在三角形ABC中,(sinA+sinB)²=sin²C+3sinAsinB,则C等于?
已知1+cosA-sinB+sinAsinB=0.1-cosA-cosB+sinAscosB=0求sinA
在三角形ABC中,若sinA^2+sinAsinB=sinC^2-sinB^2,求角C