Tan48.Tan28.Tan42.Tan67=1
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tan (90-42)*tan(90-74)*tan42 tan74
cot 42cot74tan42tan74
1/tan42*1/tan74*tan42tan74
=1
cot 42cot74tan42tan74
1/tan42*1/tan74*tan42tan74
=1
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U have a erin in question of tan28* it is tan 23
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