tan 15° tan 30° tan 45° tan 60° tan 75° = 1
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tan 15° tan 30° tan 45° tan 60° tan 75° = 1
=tan 15° tan (90-15)° tan 30°tan(90-30)° tan 45°
=tan 15° cot15° tan 30° cot30° tan 45°
=1*1*1 ( Since tan theta * cot theta=1 and tan 45°=1)
=1
Hence proved
Thank you
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