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tan 2 = cot 88
tan 4 = cot 86
tan 6 = cot 88
tan a . cot a = 1
Jadi
tan 2°.tan 88° + tan 4°.tan 86° + tan 6° tan 84°
= cot 88°.tan 88° + cot 86°.tan 86° + cot 84 tan °84°
= 1 + 1 + 1
= 3
Jadi tan 2°.tan 88° + tan 4°.tan 86° + tan 6° tan 84° = 3