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~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=√

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