Tan 100º + Tan 125º + Tan 100º Tan 125º =
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Answer:
tan ( 100° + 125° ) = tan 225° (but tan 225° = tan ( 180° + 45° ) = tan 45° = 1 )
( tan 100° + tan 125° ) / ( 1 - tan 100° tan 125° ) = 1
tan 100° + tan 125° = 1 - tan 100° tan 125°
tan 100° + tan 125° + tan 100° tan 125° = 1
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