tan15°tan25°tan45°tan65°tan75°=?
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cot (90-15)°cot (90-25)°tan45°tan65°tan75°
cot75°cot65°×1×tan65°tan75°
1/tan75×1/tan65×1×tan65×tan75
1×1×1×1×1 = 1
cot75°cot65°×1×tan65°tan75°
1/tan75×1/tan65×1×tan65×tan75
1×1×1×1×1 = 1
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