"katex" issues

[FuadEfendi]

Hi Razon,

This simple test shows $$ intstead of formulas; I have some pages like that, they show $$ and I don't know why:

---
type: docs
---

{{< katex >}}

\text{Coupon per period} = \frac{\text{Annual Coupon Rate}}{2} \times \text{Face Value}
{{< /katex >}}

{{< katex >}}

\text{Coupon per period} = \frac{9	ext{%}}{2} \times \$100 = 4.5	ext{	ext{%}} \times \$100 = \$4.50

{{< /katex >}}

For example this page:
https://securitiesexamprep.ca/3.-investment-products/7.-fixed-income-securities-pricing-and-trading/7.2-calculating-price-and-yield-of-bond/7.2.1-discount-rate/

[FuadEfendi]

Interestingly, I just realized that this syntax works perfectly:

$$
P = \sum_{t=1}^{T} \frac{C}{(1+r)^t} + \frac{F}{(1+r)^T}
$$

Where:

- \\(P\\) = price of the bond
- \\(C\\) = coupon payment
- \\(F\\) = face value of the bond
- \\(T\\) = number of periods to maturity
- \\(r\\) = YTM

[FuadEfendi]

I think when I have {{< katex >}} on a page, it activates JavaScript, and after that I can use even standard $$ (display) or (...)\ (inline)

$$ is shown probably because error in formula

[razonyang]

I'm not fimilar to KaTeX formula, but your code seems wrong.

$$ is shown probably because error in formula

Yep, the KaTeX module just wrap the formula with $$ (you can find it from source code, CRTL+U), the rest part is handled by KaTeX JavaScript.
You should check if the formula is correct, if this issue still present with correct formula, please provide a sample.