请问：已知三角形ABC是锐角三角形，P=sinA+sinB,Q=cosA+cos+cosB,则P与Q的关系为什么，为什么？

发布网友发布时间：2022-05-03 12:10

共4个回答

热心网友时间：2023-10-21 14:34

最简单方法，等边特例，有P>Q。记得这个结论吧，如果A,B为锐角，A+B=90，有sinA=cosB 。那么，如果A+B>90，有sinA>cosB 且sinB>cosA。锐角三角形这个条件说明除A，B是锐角外，恰满足A+B>90。把两个不等式相加得到

热心网友时间：2023-10-21 14:35

sinA+sinB=2sin((A+B)/2)cos((A-B)/2) cosA+cosB=2cos((A+B)/2)cos((A-B)/2)因为60<(A+B)/2<90 所以sin((A+B)/2)>cos((A+B)/2)又因cos((A-B)/2)>0 所以2sin((A+B)/2)cos((A-B)/2)>2cos((A+B)/2)cos((A-B)/2) 所以P>Q

热心网友时间：2023-10-21 14:35

We love getting feedback from our readers - we'd love to hear what you liked or disliked, what you'd like to see in the future, or simply what you think of IntoMobile. No suggestion or critique is too small or overlooked.

There is a lot more to cover on the BlackBerry Torch and OS 6, but we’ll save all the dirty details for our full review of the device coming very soon. For now,omega seamaster, enjoy these few pics we took at the event and be sure to check the official press shots and device details in our announcement post.

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The Torch 9800 was surprisingly light and well-balanced despite looking heavy, clad in metal, in all its pictures online. It’s thin, too, and feels good in the hand. While this isn’t the first touchscreen device from RIM, it is the first BlackBerry slider. My initial concern was that the slider would be flimsy, or it would have poor or wobbly travel. With most slider phones, it really is hit or miss, but the Torch is a hit. Up or down, it slides very smoothly and locks in the open or closed position with a satisfying click.

/*BlackBerry OSAT&T BlackBerry Torch 9800: Hands-on and first impressions MarcAbout MarcPosts by Marc DISCUSS 0 Tuesday, August 3rd,MBT shoe, 2010 at 1:07 PM PST

Being thin as it is, you might not expect the keyboard to feel so comfortable,omega seamaster, unlike the very comfy keyboards on the Bold 9700 or BlackBerry Tour, but you’d be wrong. Our very own Daniel Perez said, “This keyboard actually feels really good. I have plenty of space when holding it with two hands, and the keys are spaced perfectly. My thumbs don’t feel cramped or too close together.”

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Build quality feels good and as solid as we’ve come to to expect from BlackBerry devices. I saw plenty of older Curve handsets in the crowd that have clearly taken a beating, yet still working and firing away like tanks. The slider feels like it could survive a hundred thousand slides and clicks and feel like it did out of the box.

So,omega seamaster watches, after these first impressions, is it safe to say that this new device and OS will save RIM from customers wanting to flee? Could it possibly steal Android and iPhone users away from their beloved handsets? The answer is probably not and definitely not. It’s a nice handset that brings some nifty new features, but after our admittedly brief time with it we really can’t say we’ll be giving up our beloved Android and iOS handsets for now.

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Today we were at RIM’s event in New York City to see its latest baby ? the BlackBerry Torch 9800 for AT&T. It’s a bit of a departure from what you’d normally see from RIM: every single device it has ever made prior to the Torch was so unmistakable that from a distance, even look-a-likes could be confused with a BlackBerry. Its keyboard was prominent on its face along with a trackball or trackpad. And now, from a distance, I could confuse it with some LG slider phone if I wasn’t wearing my glasses. But that’s not to say I don’t like it.

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The new OS 6 now arranges icons on the lower section of the screen by your most used apps, favorites, media and others. To switch between the categories, simply swipe left or right on the screen and a new set of icons will slide into place. Messages, e-mails, Twitter alerts and the like are now placed on a bar near the top of the screen where you can tap and view its content.

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Now, onto the software. While we didn’t have have too much time with the device,coach handbags outlet, what I can say about the software is that it seemed to run perfectly fine. That is, I didn’t have to wait too long, if at all, for any action or event to happen and just about everything I did on the keyboard or screen was instantly responsive. BlackBerry OS 6 isn’t such a huge departure from OS 5 that new users will be confused and uncomfortable, but there will be a slight learning curve all over again.

Overall, the hardware was very nice, except for one glaring thing: the screen. When the Bold 9000 was released, the screen was a thing of beauty. It made all other BlackBerry handsets before it seem archaic?like going from a CRT TV to a flat screen plasma. However, in the two years since the 9000 launched, handsets like the Motorola Droid and iPhone 4 have hit the scene, both rocking 854 x 480 and 960 x 640 screens, respectively. The BlackBerry Torch 9800 is still stuck in 2009 with a 480 x 360 display, which is decent for its 3.2〃 in size diagonally, but nowhere near as crisp as what we’ve seen on the market today.

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If you enjoyed this article, please consider sharing it:*GoogleRedditStumbleUponTwitterEmail /*People who read this post also read: June 15, 2010 BlackBerry Bold 9800 Slider to be Renamed to Torch? June 22, 2010 BlackBerry 9800 Slider Gets Hands-on Impressions April 26, 2010 Hands-on with the Sprint BlackBerry Bold 9650 August 3, 2010 Ad Confirms BlackBerry 9800 to be Named Torch?

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I agree with Daniel.

Perhaps one of the biggest and most convenient features is universal search. All you have to do is slide the screen open and just start typing whatever it is you want to find. Whether it’s an e-mail, contact, web search or more, you just start typing ? no need to select any application or feature to search. Just type.

热心网友时间：2023-10-21 14:36

是不是Q的表达式写漏了东西啊？