Recent content by Vonalak

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    Preparing for AP Chem & AP Physics

    The most important thing for physics is that you are comfortable with your math skills. For Physics B, this should be algebra but for Physics C you need to know calculus. The actual physics can all be learned in the class itself.
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    Proving Trig Identity: 1-(cos(x)+sin(x))(cos(x)-sin(x))=2sin^2(x)

    Don't remove the parentheses until after you've foiled it out or you're going to lose a negative sign. Foiling 1-[(cos(x)+sin(x))(cos(x)-sin(x))], we get 1-(cos^2(x)-cos(x)sin(x)+cos(x)sin(x)-sin^2(x)). Two of the terms cancel, yielding: 1-(cos^2(x)-sin^2(x)) =1-cos^2(x)+sin^2(x) Now try using...
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    Admissions How to Cope with College Admission Rejections and Pressure?

    Many schools come out with undergraduate admissions on April 1st, there's still a good chance that you will get in somewhere, so don't give up hope so easily.
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    Proving Quadratic Inequality: (x-y)^2 ≥ 0

    Continuing from Dick's hint: (x-y)^2 ≥ 0 (Trivial inequality) x^2-2xy+y^2 ≥ 0 And adding 2xy to both sides, we get: x^2+y^2 ≥ 2xy as desired. And if you're up for it, try proving the two variable case of the AM-GM inequality from here (it's pretty simple).
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    Integration by parts and negatives

    As someone said earlier, without a strong foundation in algebra, calculus will be difficult, especially at this level. The calculus can sometimes get hard enough as is, without the tricky minutiae of algebra!
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    Integration by parts and negatives

    The negative sign was carried when it was distributed (negative * negative = positive). There's no mistake. Glad to help.
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    High School Question about calculating work done

    Work is spelled with a lower case "w", not Work; as this is a physics forum, I would assume most of the posters here know that when talking about work, the physics definition is implied.
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    Logarithmic Differentiation Problem

    Yes, that would indeed be correct.