sinA=корень(1-cos^2(A))=корень(1 - 1/4)=корень (3)/2
S = 1/2* AB*AC*sinA=1/2*4*4* (корень(3)/2=4*корень3
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sinA=корень(1-cos^2(A))=корень(1 - 1/4)=корень (3)/2
S = 1/2* AB*AC*sinA=1/2*4*4* (корень(3)/2=4*корень3