Which of the following statement about the novel The Scarlet Letter is NOT true? A: Hypocrisy and secret sin are shaped and developed through the characters. B: It is a novel that deals with the theme of sin. C: It explores guilt, revenge, and redemption in World War I. D: The novel is set in a village in Puritan New England.

【单选题】sin ( α+β ) = A. sinαcosβ-cosαsinβ B. cosαsin β-sin αcos β C. sinαcosβ+cosαsinβ D. cos αcos β-sin α sin β

For[i=1;f=Sin[x],i<3,i++,f=Sin[1+f];Print[f]]? Sin[1+Sin[x]] ; ; ; ; ; ;;Sin[1+Sin[1+Sin[x]]]|Sin[1+Sin[x]]Sin[Sin[2+Sin[x]]]|Sin[Sin[1+x]]Sin[1+Sin[1+Sin[x]]]|Sin[Sin[1+x]]Sin[Sin[1+Sin[1+x]]]

公式（）为折射定律。 A: C/C=sinα/ sinα B: sinα/C= sinβ/C= sinβ/ C C: C/C=sinα/ sinα D: 以上都不对

sin(α+β)-sin(α-β)=

已知sin（α+β）=2/1,sin（α-β）=3/1求证：sinαcosβ=5cosαsinβ

sin(α-β)cosβ+cos(α-β)sinβ=( ) A: sin(α-2β) B: cos(α-2β) C: sinα D: cosα

我想知道受力分析时什么时候用COS,什么时候SIN.什么时候用除法,什么时候

将a={1,2,3}变换为{sin1,sin2,sin3}? Sin[a]|Map[Sin,a]|Map[a,Sin]|Apply[Sin,a]

About the novel The Scarlet Letter, which of the following statements is NOT right? A: It's very hard to say that it is a love story or a story of sin. B: It’s a highly symbolic story and the author is a master of symbolism. C: It's mainly about the moral, emotional and psychological effects of the sin upon themain characters and the people in general. D: In it the letter A takes the same symbolic meaning throughout the novel