【简答题】Choose the item from column B to match the one in column A.
【单选题】cos20°cos25°-sin20°sin25°的值为( )
【简答题】2cos5°-sin25° cos25° 的值为 ______.
【简答题】Choose the item from column B to match the one in column A.
【简答题】Choose the item from column B to match the one in column A.
【简答题】sin35°?sin25°-cos35°?cos25°的值是______.