tan1° ×tan2° ×.....× tan89° =
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tan(90-1)°=cot 89°
tan 89°=sin 89°/cos 89°
cot 89°= cos 89°/sin 89°
tan 89° * cot 89° =1
tan 45°=1
ans=1
tan 89°=sin 89°/cos 89°
cot 89°= cos 89°/sin 89°
tan 89° * cot 89° =1
tan 45°=1
ans=1
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