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[" If in "/ABC,a=6,b=3" and "cos(A-B)=4/...

[" If in "/_ABC,a=6,b=3" and "cos(A-B)=4/5,],[" then its area is "],[[" (a) "8" squ "," (b) "9" sq.u."],[" (c) "6" sque "," (d) none of these "]]

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