plz answer this question plz fast
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answer in the picture , second,i haven't studied the concept of log yet
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[tan(20°) tan(70°)] [tan(35°) tan(55°)] tan(45°) =
[tan(20°) cot(20°)] [tan(35°) cot(35°)] tan(45°) =
1 * 1 * 1 =
1