sin150°+sin2135°+2sin210°+cos2225°的值是()A.B.C.D.-高一数学

题目简介

sin150°+sin2135°+2sin210°+cos2225°的值是()A.B.C.D.-高一数学

题目详情

sin150°+sin2135°+2sin 210°+cos2225°的值是(  )
A.B.C.D.
题型:单选题难度:偏易来源:不详

答案

A
解:因为sin150°+sin2135°+2sin 210°+cos2225°="sin30°+" sin245°-2sin30°+ cos245°=1-=

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