求y=sina+cosa+2sina*cosa的值域

求y=sina+cosa+2sina*cosa的值域

y=根号下2sin（a+π/3）+sin2a 当a=π1/6时值最大为2+根号3/2 a=-1/6π是最小为-2-根号3/2

负一到根号二加一

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BlackBerry Torch 9800 Site Goes Live
3.2-inch 480 x 360 pixel display
Bluetooth 2.1
Wi-Fi b/g/n
BlackBerry OS 6
512MB RAM
4GB microSD card included
5-megapixel camera
1,300mAh battery
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Posted on Aug 3, 10 08:16 AM PDT
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Looks like someone might have jumped the gun at AT&T,brand handbags, as the official site for the BlackBerry Torch 9800 has gone live just before the scheduled press conference which is (probably) going to be about said device. From the site, the specifications of the device have been confirmed as:


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