tan 55° tan 35° tan 23° tan 67°=0
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L.H.S.=tan55°tan35°tan23°tan67°
=tan(90-35)°tan35°tan(90-67)°tan67°
=cot35°tan35°cot67°tan67°
=1=R.H.S.......Proved
L.H.S.=tan55°tan35°tan23°tan67°
=tan(90-35)°tan35°tan(90-67)°tan67°
=cot35°tan35°cot67°tan67°
=1=R.H.S.......Proved
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