education/math/MATH1060 (trig)/Double and Half Angle Identities.md

@@ -1,33 +0,0 @@
-To solve for a double or half angle identity:
-1. Draw a triangle
-2. Choose an identity to use
-3. Substitute into formula
-# Double Angle Identities
-Sine:
-$$ \sin(2\theta) = 2\sin\theta\cos\theta $$
-Cosine:
-$$
-\begin{matrix}
-\cos(2\theta) = \cos^2\theta - \sin^2\theta\\
-= 1 - 2sin^2\theta\\
-= 2cos^2\theta - 1\\
-\end{matrix}
-$$
-
-Tan:
-$$ \tan(2\theta) = \dfrac{2\tan\theta}{1-\tan^2\theta}$$
-
-## Half Angle Identities
-Whether the output is positive or negative depends on what quadrant the output is in.
-Sine:
-$$ \sin(\frac{\theta}{2}) = \pm\sqrt{\frac{1-\cos\theta}{2}} $$
-Cosine:
-$$ \cos(\frac{\theta}{2}) = \pm \sqrt{\frac{1 + \cos\theta}{2}} $$
-Tangent:
-$$
-\begin{matrix}
-\tan(\dfrac{\theta}{2}) = \pm\sqrt{\dfrac{1-\cos\theta}{1 + \cos\theta}}\\
-= \dfrac{\sin\theta}{1 + \cos\theta}\\
-= \dfrac{1 - cos\theta}{\sin\theta}
-\end{matrix}
-$$

education/software development/ECE1400/C.md

@@ -52,17 +52,7 @@ int arr_size = sizeof(arr) / sizeof(arr[0]);
 `&` gives you the address of a variable
 `*` gives you the value in memory that an address points to.
 
-To update the value a pointer points at, you can dereference on the left hand side of the assignment operator:
-```c
-// Update the value `p` points at to be 7
-*p = 7;
-```
 
-Because of how operator precedence works, parentheses should be placed around the dereference operator and the variable
-```c
-// Increment the value pointed to by `p`
-(*p)++;
-```
 # Formatting specifiers
 # Standard library
 ## Formatting specifiers

education/software development/ECE1400/Chapter 12 Exercises.md

@@ -23,12 +23,3 @@ middle = low + (high - low) / 2;
 The following expressions are illegal because of mismatched types:
 - (a) `p == a[0]` - Comparison between `int *` and `int`
 The rest of the expressions are true.
-
-8. Rewrite the following function to use pointer arithmetic...
-```c
-void store_zeros(int *a, int n) {
-    for (int i = 0; i < n; i++) {
-	*(a + i) = 0;
-    }
-}
-```