Dear TenzinShi, two months ago my class reached chapter five of the mathematic textbook, and it mainly centers around the basic trigonometry formulas which are sin, cos, and tan. At first I thought of it as obsolete, but when we reached chapter six a few weeks ago, which at one point needs the application of tangent, I have come to realize that trigonometry is brilliant. Like-
I can't even begin to explain how fascinated I am
So yeah we were taught to applicate trigonometry into geometry and it's SO fascinating