Tan15°+Tan30°+Tan15°Tan30°=1
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tan(a+b)= tan a + tan b / 1 - tan a tan b
a =30 b=15
tan45=1=tan30+tan15 / 1-tan30 tan15
tan 30 + tan 15 = 1-tan30 tan 15
so finally we can prove that
tan 15+ tan 30 +tan 15 tan 30 = 1
a =30 b=15
tan45=1=tan30+tan15 / 1-tan30 tan15
tan 30 + tan 15 = 1-tan30 tan 15
so finally we can prove that
tan 15+ tan 30 +tan 15 tan 30 = 1
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