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Question

If tan(A+B)=3 and tan(AB)=13;0o<A+B90o;A>B, find A and B.

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Solution

tan(A+B)=3=tan60

A+B=60.......I

tan(AB)=13=tan30

AB=30.........II

solving I and II, we get,

A=45

B=15


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