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the derivative of cos(2x) with the double-angle formula?
So, last minute my teacher posted something saying to study double-angle formulas for our derivative test tomorrow. So in the back of the book it shows th...
Apr 14, 2026
Archive: News
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Find $\sin(\theta/2)$, given that $\sin \theta = -4/5$ and $\theta$ terminates in $180^\circ<\theta<270^\circ$
Sorry, I'm having trouble with this trigonometry question Find $\sin(\theta/2)$, given that $\sin \theta = -4/5$ and $\theta$ terminates in $180^\cir...
Apr 14, 2026
![Having trouble converting sin results between degrees and radians [closed]](https://news.conceivablytech.com/uploads/having-trouble-converting-sin-results-between-degrees-and-radians-closed_720.jpg)
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Having trouble converting sin results between degrees and radians [closed]
If I open the MS calculator and put it in deg mode at take the sin(2.23) I get .0389. Then if I put the calc into rad mode and take the sin(.039) I get .0...
Apr 14, 2026
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Define positions of a set of points given (only) the distances between them
I have been thinking about spatial transforms. Given $n$ points, there are $\frac{n!}{(n-2)!2!}$ combinations of selecting two points, so for 64 points in...
Apr 14, 2026
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Modular exponentiation by repeated squaring
I came upon an interesting way to relatively quickly compute modular exponentiation with large numbers. However, I do not fully understand it and was hopi...
Apr 14, 2026
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Inner tangent between two circles formula
As a programmer I need to draw the inner tangents between two circles, but only the segments, not the whole line. But the internet is surprisingly hostile...
Apr 14, 2026
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Discrete Probability - Flipping a coin 5 times in a row.
Hey guys, so I think the first thing I'm going to do is write out all of the possibilities (Sample Space). But basically since we're flipping th...
Apr 14, 2026
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What does $\tan x = 1$ mean?
I can solve for $x$ by taking the arctangent of both sides but I'm not understanding what the equation means. Does the equation represent the interes...
Apr 14, 2026
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Show that if $p(X) = X^2 - (a+d)X + (ad-bc)$ and $A $ is a $2 \times 2$ matrix, then $p(A) = 0$
Show that if $p(X) = X^2 - (a+d)X + (ad-bc)$ and $A = \begin{bmatrix}a & b\\c&d\end{bmatrix}$ then $p(A) = 0$ My attempted solution: $$\begin{alig...
Apr 14, 2026
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Calculating the generator of a Finite Field
I'm trying to understand how to compute the generator of a finite field. $\alpha \in GF(q)$ so for example if I was working with $GF(2^8)$ I think I ...
Apr 14, 2026
