化简～(cos(a+15))^2+(sin(a-15))^2+sinacos(a-180)
人气：480 ℃ 时间：2020-06-05 16:25:47
解答
(cos(a+15))^2+(sin(a-15))^2+sinacos(a-180)
=[1+cos(2a+30)]/2 +[1-cos(2a-30)]/2-sina cosa
=1/2+cos(2a+30)/2+1/2-cos(2a-30)/2-sin2a/2
=1+cos2acos30-sin2asin30-cos2acos30-sin2asin30
-sin2a/2
=1-2sin2asin30-sin2a/2
=1-sin2a-sin2a/2
=1-sin2a/2
推荐
- 化简~cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)
- 化简cos^2(a+15)+sin^2(a-15))+sin(a+180)cos(a-180)
- sin（a+180度）cos（-a）sin（-a-180度）化简
- 化简sin(α+180°)cos(-α)sin(-α-180°)
- 化简：cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度)
- 材料一反应二战后美国在欧洲实行什么政策
- 30只羊,7天杀完,必须天天杀,杀单数不杀双数,怎么杀法
- 分别给出卑鄙,猖獗,谢,往往,绝境,但,博士,作文的古今义
猜你喜欢
