求求下列各式的值 (1)sin^262°+tan54°tan45°tan36°+sin^28° (2)tan1°tan2
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求求下列各式的值 (1)sin^262°+tan54°tan45°tan36°+sin^28° (2)tan1°tan2°tan3°……tan89°
![求求下列各式的值 (1)sin^262°+tan54°tan45°tan36°+sin^28° (2)tan1°tan2](/uploads/image/z/20058941-29-1.jpg?t=%E6%B1%82%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%80%BC+%EF%BC%881%EF%BC%89sin%5E262%C2%B0%2Btan54%C2%B0tan45%C2%B0tan36%C2%B0%2Bsin%5E28%C2%B0+%EF%BC%882%EF%BC%89tan1%C2%B0tan2)
(1)
sin^2(62°)+tan54°tan45°tan36°+sin^2(28° )
= sin^2(62°) + tan54°tan45°tan(90°-54°)+sin^2(90°-62° )
= sin^2(62°) + tan54°tan45° cot54° + cos^2(62° )
= sin^2(62°) + cos^2(62° )+ tan54°cot54° tan45°
= 1 + 1*1
= 2
(2)
tan1°tan2°tan3°……tan89°
= tan1°tan89° * tan2°tan88° *……tan44°tan46° * tan45°
= tan1°cot1° * tan2°cot2° *……tan44°cot44° * tan45°
= 1*1*...181
= 1
sin^2(62°)+tan54°tan45°tan36°+sin^2(28° )
= sin^2(62°) + tan54°tan45°tan(90°-54°)+sin^2(90°-62° )
= sin^2(62°) + tan54°tan45° cot54° + cos^2(62° )
= sin^2(62°) + cos^2(62° )+ tan54°cot54° tan45°
= 1 + 1*1
= 2
(2)
tan1°tan2°tan3°……tan89°
= tan1°tan89° * tan2°tan88° *……tan44°tan46° * tan45°
= tan1°cot1° * tan2°cot2° *……tan44°cot44° * tan45°
= 1*1*...181
= 1
tan54°×tan36°=1,可以不用计算器算吗,写下
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