RT
RT
(sinx)^3+(cosx)^3 最大值是多少
(sinx)^3+(cosx)^3 最大值是多少
数学人气：642 ℃时间：2020-09-23 07:52:21
优质解答
(sinx)^3+(cosx)^3=(sinx+cosx)(sin^2x-sinxcosx+cos^2x).=√2sin(x+45°)[1-(1/2)sin2x].当 sin2x=0,2x=0,x=0 时,(sin^3x+cos^3x)max=√2sin(x+45°)=√2sin45°=√2*√2/2=1.或当 sin2x=0,2x=180°,x=90° 时,原式...
我来回答
类似推荐
猜你喜欢
- 1改错
- 2I am always hungry,I must always be fed,The finger I lick Will soon turn red
- 3英语中的从句到底是啥?怎么理解
- 4It has been three weeks since he lived here with us and now____.
- 5一个多边形的对角线共有20条,那么这个多边形的边数是（）?
- 6,
- 7I like some parts of the day and I don't like o_____
- 8将一个直角三角形切成2块,在拼成一个与原三角形等面积的矩形,有几种拼发
- 9第三人称单数后面用了will,动词还要加S吗
- 10What am I for you； What is you for me."nothing" ,that is all.