已知AB为钝角,且,sinA=√5/5,sinB=√10/10,求A+B~
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![已知AB为钝角,且,sinA=√5/5,sinB=√10/10,求A+B~](/uploads/image/z/11507437-37-7.jpg?t=%E5%B7%B2%E7%9F%A5AB%E4%B8%BA%E9%92%9D%E8%A7%92%2C%E4%B8%94%2CsinA%3D%E2%88%9A5%2F5%2CsinB%3D%E2%88%9A10%2F10%2C%E6%B1%82A%2BB%7E)
已知AB为钝角,且,sinA=√5/5,sinB=√10/10,求A+B~
已知AB为钝角,且,sinA=√5/5,sinB=√10/10,求A+B~
已知AB为钝角,且,sinA=√5/5,sinB=√10/10,求A+B~
cosA=-2√5/5,cosB=-3√10/10.
sin(A+B)=sinAcosB+sinBcosA=-7/10
90