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Mathematics 8 Online
OpenStudy (4meisu):

BB' and CC' are medians in the triangle ABC (B'∈AC and C'∈AB). Let AB=u and AC=v Assume that ABC is an isosceles triangle in which BB' is perpendicular to CC'. Show that cos (angleA)=0.8

OpenStudy (4meisu):

OpenStudy (4meisu):

Really need help with 8b!

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