What is the value of (tan 1 degree tan 2 degree tan 3 degree…...tan 89 degree)?

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Here, tan 1°× tan 89° = tan 1° × cot 1 ° = 1 & Similarly, tan 2°× tan 88° = 1 as so on. So the value of, tan1° × tan2° × ... tan 89° = tan 45° = 1
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