式子cos9°-sin9°/sin18°cos18°的值是?
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式子cos9°-sin9°/sin18°cos18°的值是?
sin21°cos9°+cos21°sin9°=?
cos39°cos9°+sin39°sin9°=
cos51°cos9°-cos39°sin9°=
化简COS8°-SIN17°SIN9°/COS9°
化简COS8°-SIN17°SIN9°/COS9°
4(sin18°)平方+4(cos36°)平方4sin²18°+4cos²36°=4sin²18°+4(1-sin²36°)=4-4(sin²36°-sin²18°)=4-4(sin36°+sin18°)(sin36°-sin18°)=4-4*2sin27°cos9°*2cos27°sin9°=4-4*(2sin27°cos27°)*(2sin9°cos9°)=4-
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sin9+cos15sin6/cos9-sin15sin6
sin18°cos36°
sin18°×cos32°
sin18°=?
不查表求sin18°
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求值:sin18°*sin54°