问题
填空题
cos43°cos77°+sin43°cos167°的值为______．
答案
cos43°cos77°+sin43°cos167°
=cos43°cos77°-sin43°sin77°
=cos120°
=-
．1 2
故答案为：-1 2
搜题请搜索小程序“爱下问搜题”
cos43°cos77°+sin43°cos167°的值为______．
cos43°cos77°+sin43°cos167°
=cos43°cos77°-sin43°sin77°
=cos120°
=-
．1 2
故答案为：-1 2
