Some math rendered, some not rendered

First photo is from my text editor. In my website it looks like this:

But some math equations looks exactly like text editor. For example:

First one is my text editor. Second one is my website. I don’t know why this is not rendered. Other equations are normal. How can I fix that? This is the link of my post: https://www.mathkolik.com/trigonometrik-fonksiyonlarin-turevleri/