sin²120°+cos180°+tan45°-cos²330°+sin(-210°)
sin²120°+cos180°+tan45°-cos²330°+sin(-210°)
急用,注意 是cos²330°
急用,注意 是cos²330°
數(shù)學(xué)人氣:623 ℃時(shí)間:2020-04-05 04:36:11
優(yōu)質(zhì)解答
sin120°=sin60°=√3/2
cos180° = -1
tan45°=1
cos330° = cos30° = √3/2
sin(-210°) = sin(-360°+150°)=sin150°=sin30°=1/2
原式=3/4-1 + 1 - 3/4 + 1/2 = 1/2
我來回答
類似推薦
- cos²25°+sin²25°-tan21°cot21°×tan45°
- Sin平方120度加Cos180度加Tan45度減Cos平方(-330度)加Sin(-210度)等于多少?要有點(diǎn)過程最好,麻煩...
- sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=_.
- sin²25°+2sin60°+tan45°-tan60°+cos²25°=
- cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45°
- 美利堅(jiān)合眾國各州The States of the United States of America
- what do you like to do英語作文,越多越好
- 意思是形容失意時(shí)情緒低落,提不起精神的樣子的四字詞語
- A,B,C為中學(xué)化學(xué)常見化合物,甲,乙,丙為單質(zhì)
- 一件成品為200元的商品標(biāo)出的價(jià)格為400元,現(xiàn)打7.5折出售此商品,則可獲得利潤 元,其利潤為
- 正方形的邊長為4厘米,剪去四個(gè)角后成為一個(gè)正八邊形.求這個(gè)正八邊形的邊長和面積
- 先判斷x與y成什么比例,再填表
猜你喜歡
- 1island怎么讀
- 2whereis she?怎么轉(zhuǎn)換為do you know where she is
- 3求軍訓(xùn)1000字的心得體會(huì)!
- 4帶橋字的成語 越多越好
- 5and only want to sleep with you and have babies with you..maybe i am nota good englsh teacher
- 6請(qǐng)問,正電荷可不可以移動(dòng)?還有,神經(jīng)纖維和神經(jīng)元有關(guān)系嗎?
- 7The studengts have a long holiday in some parts of the US.The school year begins in late August or early Septembeer,and
- 8西電東送工程中,中線和南線的電力主要來自于對(duì)河流中上游的梯級(jí)開發(fā),流域梯級(jí)開發(fā)除發(fā)電外,對(duì)區(qū)域經(jīng)濟(jì)發(fā)展帶來的有利影響有什么(4個(gè))
- 9,甲乙兩筐蘋果共112個(gè),如果從甲筐中拿出蘋果給乙筐,再從乙框中拿出五分之一放入甲筐,結(jié)果兩筐蘋果就一樣
- 10英語翻譯
- 11that was a statement
- 12生物圈和生態(tài)系統(tǒng)的概念