von luger

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2. Feature Requests and General Site Feedback
3. An offline version would be awesome

Hi! Although KA currently does not have an offline version, your idea sounds great to me. I'll forward the feedback to higher staff so that they can escalate it, and hopefully work on creating some...

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2. Study Group
3. Derivatives of inverse trig functions sec^-1(x) and csc^-1(x)

These videos worked for me, since I don't think that KA has proofs for more advanced trig derivatives like those. Feel free to check these out, and let me know if they help. If not, I can try to fi...

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2. Study Group
3. Derivatives of inverse trig functions sec^-1(x) and csc^-1(x)

Just to clarify what you are asking, when you say you want the derivatives of sec^-1(x) and csc^-1(x), do you mean arcsec(x) and arccsc(x), or the reciprocals of secant and cosecant? Because sec^-1...

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2. Study Group
3. Calculating the derivative of a cosine function

One of the applications that I can think of has to do with physics. In fact, almost everything you learn in differential calculus is applied to physics. For example, the motion of an object attache...

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2. Study Group
3. molecular orbital theory

The bond order is needed to calculate the strength of the bond, and it relies on the concept of bonding and antibonding orbitals. We need to create the schematic representation with its bonding and...

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2. Study Group
3. molecular orbital theory

@Pauline Yep, you can do it right here on Khan Academy! Here's the site home: https://www.khanacademy.org/science/chemistry However, if you just want to brush up and want some quick review, I would...

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2. Study Group
3. molecular orbital theory

1. In molecular orbital theory, a covalent bond is formed whenever two atoms overlap all of their orbitals, regardless of whether they are valence orbitals or not, to create bonding and antibonding...

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2. Content Requests and Feedback
3. Request to add content about Einstein's theory of relativity

Wonderful, I'll go ahead and do that. 

1. Community
2. Content Requests and Feedback
3. Request to add content about Einstein's theory of relativity

Hi Dekin, I found a content page for special relativity (https://www.khanacademy.org/science/physics/special-relativity), but not general relativity, as you wanted. Unfortunately, I don't think we ...

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2. Study Group
3. why is this compund inequality not following the rules of divideing a negative number?

Here's how I would solve this question; that might clear up some confusion.  12x - 39 < 9 12x < 48 x < 4 and  -4x + 3 < -6 -4x < -9 x > (9/4) So, 9/4 < x < 4 If you need any clarification in terms ...