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数学
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cos24°cos36°-cos66°cos54°的值等于( )
A. 0
B.
1
2
C.
3
2
D. -
1
2
人气:224 ℃ 时间:2020-08-11 14:40:47
解答
cos24°cos36°-cos66°cos54°=sin66°cos36°-cos66°sin36°=sin(66°-36°)=sin30°=
1
2
故选B.
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