tan (100) + tan (125) + tan 100 x tan 125°
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Answer:
tan ( 100° + 125° ) = tan 225°
also,
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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