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5 changed files with 1 additions and 216 deletions

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@ -74,53 +74,11 @@ Given the form $y = A\tan(Bx - C) + D$ (the same applies for $\cot$)
- The range of both is $(-\infty, \infty)$ - The range of both is $(-\infty, \infty)$
- The phase shift is $\frac{C}{B}$ - The phase shift is $\frac{C}{B}$
- The vertical shift is $D$ - The vertical shift is $D$
# Secant
$$ y = \sec(x) $$
![Graph of secant](assets/graphsec.jpg)
$$ sec(x) = \frac{1}{\cos{x}} $$
Because secant is the reciprocal of cosine, when $\cos{x} = 0$, then secant is undefined. $|\cos$| is never *greater than* 1, so secant is never *less than* 1 in absolute value. When the graph of cosine crosses the x axis, an asymptote for a matching graph of secant will appear there.
The general form of secant is:
$$ y = A\sec(B{x} - C) + D $$
$A$, $B$, $C$, and $D$ will have similar meanings to the secant function as they did to the sine and cosine functions.
# Cosecant
$$ y = \csc(x) $$
![Graph of cosecant](assets/graphsec.jpg)
$$ \csc(x) = \frac{1}{\sin(x)} $$
Because cosecant is the reciprocal of sine, when $\sin{x} = 0$, then cosecant is undefined. $|\sin$| is never *greater than* 1, so secant is never *less than* 1 in absolute value. When the graph of sine crosses the x axis, an asymptote for a matching graph of cosecant will appear there.
The general form of cosecant is:
$$ y = A\csc(B{x} - C) + D $$
$A$, $B$, $C$, and $D$ will have similar meanings to the cosecant function as they did to the sine and cosine functions.
# Features of Secant and Cosecant
- The stretching factor is $|A|$
- The period is $\frac{2\pi}{|B|}$
- The domain of secant is all $x$, where $x \ne \frac{C}{B} + \frac{\pi}{2} + \frac{\pi}{|B|}k$, where $k$ is an integer. (Every half period + phase shift is where asymptotes appear)
- The domain of cosecant is all $x$, where $x \ne \frac{C}{B} + \frac{\pi}{|B|}k$, where $k$ is an integer.
- The range is $(\infty, -|A| +D]\cup [|A| + D], \infty)$
- The vertical asymptotes of secant occur at $x = \frac{C}{B} + \frac{\pi}{2} + \frac{\pi}{2} + \frac{\pi}{|B|}k$, where $k$ is an integer.
- The vertical asymptotes of cosecant occur at $x = \frac{C}{B} + \frac{\pi}{|B|}k$, where $k$ is an integer.
- The vertical shift is $D$.
# Examples # Examples
> Given $-2\tan(\pi*x + \pi) - 1$ > Given $-2\tan(\pi*x + \pi) - 1$
$A = -2$, $B = \pi$, $C = -\pi$, $D = -1$ $A = -2$, $B = \pi$, $C = -\pi$, $D = -1$
> Identify the vertical stretch/compress factor, period, phase shift, and vertical shift of the function $y = 4\sec(\frac{\pi}{3}x - \frac{\pi}{2}) + 1$
$A = 4$, $B = \frac{\pi}{3}$, $C = \frac{\pi}{2}$, $D = 4$
Vertical stretch: $|4| = 4$
Period: $\frac{2\pi}{\frac{\pi}{3}} = \frac{2\pi}{1} * \frac{3}{\pi} = 6$
Phase shift: $\dfrac{\frac{\pi}{2}}{\frac{\pi}{3}} = \frac{3}{2}$
Vertical shift: $1$
| Transformation | Equation | | Transformation | Equation |
| -------------- | ------------------------- | | -------------- | ------------------------- |
| Stretch | $\|-2\| = 2$ | | Stretch | $\|-2\| = 2$ |

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