tan 10×tan 15×tan 75×tan 80
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Tan 10×tan 80×tan15×tan75
Tan(90-10)×tan 80×tan (90-15)×tan 75
Cot 80×tan 80×cot 75×tan 75
1/tan80×tan 80×1/tan75 ×tan75
1×1
1
Tan(90-10)×tan 80×tan (90-15)×tan 75
Cot 80×tan 80×cot 75×tan 75
1/tan80×tan 80×1/tan75 ×tan75
1×1
1
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