tan(π/12)tan(5π/12)tan(7π/12)tan(11π/12)=?
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tan15 × tan75 × tan 105 ×tan 165
tan (90-75) ×tan75 ×tan (270-165)×tan165
cot75× tan75×cot165 ×tan165
1×1
1
tan (90-75) ×tan75 ×tan (270-165)×tan165
cot75× tan75×cot165 ×tan165
1×1
1
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