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Now A + B + C = 180
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60 + B + 90 = 180
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B = 30
Example 7: GiventanA = , tanB = and tan(A + B) = . Find the value
of A + B.
Solution : tan(A + B) = (i)
Substituting the values in LHS of (i), we get,
tan(A + B) = 1
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tan(A + B) = tan45
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A + B = 45
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