Question from Quora There are basically two terms here, the 5x and the 1- x^2 in parentheses. The general idea for u-substitution is to make u something that when you take the derivative of …

## How to do a phasor calculation with radians using a principle of Eulers Formula

"How has this been calculated? I try to convert the 7.11 to radians and sum it up, then converting it back to degrees. However I do not get 1.61." -Quora question My response: The numbers are …

## “Should I skip Pre-Calculus?”

Trigonometry, if it's included, is very important for several things and could very well be included in precalculus. Check out the syllabus and book for what would be included. I would also think …

## “why does $x^{1/2} = +\sqrt{x}$ not $±\sqrt{x}$?”

Seems you are asking about, in the context of differentiation, you're not asking about how to actually differentiate. I think you're asking why it is not true that x^{1/2} = ±\sqrt{x}? Since it …

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## “What are the practical uses of calculus, other than calculating the area under curves?”

Among other things, one thing you learn early on in calculus that can be very powerful is Optimization. If you know how to take a derivative, you can find where the first derivative is equal to …

## What is Implicit Differentiation?

Usually when you start to take derivatives you begin with equations that say y = ........ You see y on the left side of the equation, but only once and by itself. And at first there is generally …