y＝cos2x-sinx化簡(jiǎn)為1-sin2x-sinx,接下來(lái)怎么做的,要求詳細(xì)講解和解題方法,弄明白了百分百采納!
y＝cos2x-sinx化簡(jiǎn)為1-sin2x-sinx,接下來(lái)怎么做的,要求詳細(xì)講解和解題方法,弄明白了百分百采納!
數(shù)學(xué)人氣：180 ℃時(shí)間：2020-04-07 15:22:01
優(yōu)質(zhì)解答
y=cos2x-sinx=1-2sin²x-sinx=-2(sin²+1/2sinx+1/16)+1/8+1=-2(sinx+1/4)²+9/8因?yàn)?3/4≤sinx+1/4≤5/4所以0≤(sinx+1/4)²≤25/16所以-25/8≤-2(sinx+1/4)²≤0所以-2≤-2(sinx+1/4)²+9...
我來(lái)回答
類似推薦
- 化簡(jiǎn):(sinx+sin2x)/(1+cosx+cos2x)
- 化簡(jiǎn):(sinx+sin2x)/(1+sinx+cos2x)
- 化簡(jiǎn) （1+sin2x-cos2x)/(1+sin2x+cos2x)
- 若4sin2x-6sinx-cos2x+3cosx=0．求：cos2x?sin2x(1?cos2x)(1?tan2x)的值．
- 化簡(jiǎn)[1+SIN2X-COS2X]/[1+SIN2X+COS2X]的結(jié)果
- 函數(shù)f(x)=sinx-cosx^2的最小值是?
- 英語(yǔ)翻譯
- I took my grandpa to the hospital this morning,_____ I missed the first class.
- So crazy
- 方差是各個(gè)數(shù)據(jù)與平均數(shù)之差的平方的平均數(shù)
- 函數(shù)y=f(x)與它反函數(shù)y=f^-1(x)怎么讀?
- These are photos of my families.Look at them 改錯(cuò)
猜你喜歡
- 1平面與平面重合,是否屬于平行一類?那重合的兩直線,也屬于平行一類的嗎?
- 2非洲每年因饑餓死亡的人數(shù)及現(xiàn)在饑餓人口數(shù)量拜托各位了 3Q
- 3decide to do sth.還=什么
- 4(7/8)o you think of london?B:5.____london is one of the liveliest cities
- 5啤酒可以托運(yùn)嗎
- 6邊長(zhǎng)為2√6的等邊三角形的中心到一邊的距離為?
- 7please give your hand to help me
- 8已知2的X次方等于3的Y次方等于6的Z次方不等等于1,證明X分之一加Y分之一等于Z分之一.
- 9幫我做做?
- 10機(jī)械分析天平TG628A的使用說(shuō)明書(shū)
- 11in winter ,we wear warm coats to protect our bodies_.
- 12( )was most importance to her ,she told me,was her family it this what as