Proving Search Results

How To: Prove cos(a+b)=(cos a)(cos b)-(sin a)(sin b) in trig

Need help proving the cos(a+b) = (cos a)(cos b)-(sin a)(sin b) trigonometric identity? This free video lesson will show you how. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series ...

How To: Prove sin(a+b)=(cos a)(sin b)+(sin a)(cos b) in trig

Need help proving the sin(a+b)=(cos a)(sin b)+(sin a)(cos b) trigonometric identity? This free video lesson will show you how. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of...

How To: Prove Heron's Formula

This two part video walks you through the steps of in proving Heron's formula. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any question you may have, will be answered. Watching this video will make you feel like your back in the classroom but rather comfortably from your home.

How To: Prove side-side-side congruency

In this "Math Made Easy" geometry episode, you learn how to prove that two triangles are congruent (equal) by using the "side-side-side" evidence. By using "side-side-side" to prove that two triangles are congruent, you are stating that all the respective corresponding sides of two triangles are equal in length thus proving the triangles are congruent. The narrator in this tutorial provides you with definitions about statements, proofs, and congruency. This becomes useful when setting up a ta...

How To: Make watermarks in paper for security

Don't fret too much if your watermark is barely noticeable when you're finished with this project - the less obvious it is, the better a job you've done. Watermarkers are present in many types of paper, especially the monetary kind. If you hold up a ten dollar bill you'll see a watermark of Thomas Jefferson's face on the right, proving the bill is real.

How To: Create convincing, but utterly fake, UFO photographs and videos

Aliens… do they exist? Can anyone say for sure? No, but some do swear of their existence, and some swear on a more personal level, although some say that alien abductions are going a little "too" far in proving aliens exist. But a more common staple of proof of aliens are UFOs, or Unidentified Flying Objects. UFOs have been sighted all over the world, even by the military and NASA, so who's to say they're fake? I guess you, especially if you're the culprit behind it…

How To: Verify Your Bumble Account to Help Fight Catfishing

As the stigma of online dating fades and swiping potential suitors on your phone becomes the new norm, one very real issue that you may have to deal with is catfishing: the act of being deceived by a fictional online persona. Although dating apps do their best to weed out fake accounts, a few of them slip through the cracks and take advantage of innocent people just looking for a connection.

News: Why Social Media Is for Women (& the Men Who Want to Date Them)

Gender standards are entirely pervasive. We raise our sons to be masculine and our daughters to be feminine, which perpetuates the gender role formula when they grow up to be parents and raise their own children. Part of this whole equation is that boys are supposed to remain stoic and project an air of strength, and girls are expected to be amiable while being held to unrealistic standards of outward beauty.

Brief Reality: Home Audio Speakers Could Soon Project Holograms

One inventor wants to bring augmented reality to internet radio and home audio speakers. Meanwhile, a leading consumer electronics company has opened up access its deep learning tools for building augmented reality apps. In addition, analysts examine how augmented reality will impact the design and construction and profile the top developers in augmented and virtual reality.

How To: Get Nintendo's Fire Emblem Heroes Game on Your Android Phone Right Now

Nintendo's first ever game for Android has finally touched down (unless you actually count the abomination that is Miitomo). Fire Emblem Heroes, a classic turn-based RPG optimized for mobile gaming, has come out for Android and iOS in Australia, Europe, and Japan, and is due out in North America and other worldwide locales very soon. Due to Nintendo's staggered release, the game isn't available to us in the United States at the time of this writing, but fret not—there's another way to downloa...

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