Tan 48.tan 16.tan tan 42.tan 45.tan 74
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= tan48.tan42.tan16.tan74.tan45
=tan48.tan(90-48).tan16.tan(90-16).tan45
=tan48.cot48.tan16.cot16.tan45
=1.1.1
=1
=tan48.tan(90-48).tan16.tan(90-16).tan45
=tan48.cot48.tan16.cot16.tan45
=1.1.1
=1
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