已知tana=1/2 求 sin^2+sina+2的值已知tana=1/2 求 sin^2a+sina+2的值

已知tana=1/2 求 sin^2+sina+2的值已知tana=1/2 求 sin^2a+sina+2的值
已知tana=1/2 求 sin^2+sina+2的值
已知tana=1/2 求 sin^2a+sina+2的值

已知tana=1/2 求 sin^2+sina+2的值已知tana=1/2 求 sin^2a+sina+2的值
tana=sin5A/cosA=1/2
2SINA=cosA 而sin^2a+cos^2a=1
解得
sina=±根号5/5
再代入式子就行了

iTunes 9 for Mac + PC Black Orpheus Original Soundtrack View More by this Artist
Top Albums and Songs by Original Soundtrack 1 The Cheetah Girls 2 (Original Soundtrack) View In iTunes 2 Funny Fa...

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iTunes 9 for Mac + PC Black Orpheus Original Soundtrack View More by this Artist
Top Albums and Songs by Original Soundtrack 1 The Cheetah Girls 2 (Original Soundtrack) View In iTunes 2 Funny Face View In iTunes 3 The Mirror Has Two Faces - Music From the Motion Picture View In iTunes 4 Black Orpheus View In iTunes 5 Revenge of the Nerds (Original Motion Picture Soundtrack) View In iTunes Name Album Time Price 1 What Lola Wants: Shoeless Joe From Hanibal Mo What Lola Wants 3:20 $0.99 View In iTunes 2 On The Town: Count On Me On The Town 4:20 $0.99 View In iTunes 3 On The Town: Come Up To My Place On The Town 2:47 $0.99 View In iTunes 4 On The Town: Prehistoric On The Town 4:30 $0.99 View In iTunes 5 What Lola Wants: Who's Got The Pain What Lola Wants 3:32 $0.99 View In iTunes 6 On The Town: You're Awful On The Town 3:54 $0.99 View In iTunes 7 Bang Bang Four Guys Named Jose and una Mujer Named Maria! (Original Cast Recording) 1:27 $0.99 View In iTunes 8 Main Title 1001 Arabian Nights 3:40 $0.99 View In iTunes 9 Magoo's Blues 1001 Arabian Nights 2:10 $0.99 View In iTunes 10 Sultan's Parade/you Are My Dream 1001 Arabian Nights 3:14 $0.99 View In iTunes View In iTunes $5.99 Genres: Soundtrack, Music Released: Jan 01, 2010 ? 2010 Pickwick Customer Ratings 6 Ratings Home iTunes iTunes Download iTunes 9 What is iTunes? What’s on iTunes iTunes Charts A-Z Features How Tos More iTunes Digital Music Basics iTunes Gifts TV Ads iPod + iTunes Support Accessibility Partner with iTunes Overview Content Providers Companies and Organizations iTunes Tagging iTunes LP and iTunes Extras iTunes Store Browse Music Browse Apps Browse Podcasts Buy Music Now Buy iTunes Gift Cards Redeem iTunes Gift Cards ? Free Single of the Week New Music Tuesday Complete My Album iTunes Plus Music Requests iTunes Corporate Sales
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Name Artist Time Price 1 Black Orpheus: Generique / Felicidade / Frevo / O Nosso Amor Breno Mello 9:24 $0.99 View In iTunes 2 Black Orpheus: O Nosso Amor Breno Mello 4:20 $0.99 View In iTunes 3 Black Orpheus: Manha de Carnaval / Scene Du Lever Du Soleil Breno Mello 3:46 $0.99 View In iTunes 4 Black Orpheus: Manha de Carnaval Breno Mello 1:33 $0.99 View In iTunes 5 Black Orpheus: Scenes de la Macumba Breno Mello 3:09 $0.99 View In iTunes 6 Black Orpheus: O Nosso Amor Breno Mello 5:08 $0.99 View In iTunes 7 Black Orpheus: Manha de Carnaval Breno Mello 2:56 $0.99 View In iTunes 8 Black Orpheus: Samba de Orfeu Breno Mello 2:15 $0.99 View In iTunes 9 Black Orpheus: Batterie de Cappela Breno Mello 4:51 $0.99 View In iTunes Total: 9 Songs Customer Reviews I purhcased the song Samba de orfeu by joedyf
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