tan A/2=5/2 and tan B/2=3/4 then value of cos (A+B)
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a/2=5/2
a=5
b/2=3/4
b=3/2=5/1+3/2=10+3/2=13/2
a=5
b/2=3/4
b=3/2=5/1+3/2=10+3/2=13/2
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