solve the question tan X + tan 2 X + tan X tan 2x =1
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tan X + tan 2x = 1- tan X* tan 2x
(tan X + tan 2x )/( 1-tan X *tan 2x) = 1
tan 3x = 1
tan 3x = tan 45
3x = 45
X = 15°
(tan X + tan 2x )/( 1-tan X *tan 2x) = 1
tan 3x = 1
tan 3x = tan 45
3x = 45
X = 15°
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