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In `Delta ABC ` , a= 6 ,b=3 and cos (A-B) = 4/5 .Then are of triangle is

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In `Delta ABC ` , a= 6 ,b=3 and cos (A-B) = 4/5 .Then are of triangle is
A. 4 square - unit
B. 6 square - unit
C. 9 square unit
D. 12 square - unit
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Correct Answer - C
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