starting on snippets folder keeping track of my thoughts since i lost my

thing

snippets/rotate/rotate.md

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+# Rotate
+
+as far as i understand this function, it functions by multiplying a 2d vector by a mat2 (2x2 matrix as far as i can tell) like this:
+
+[[cos(angle),-sin(angle)],       [x,
+[sin(angle),-cos(angle)]]     x   y]
+
+creating something like this:
+```
+st.x = cos(angle)*st.x - sin(angle)*st.x
+st.y = sin(angle)*st.y - cos(angle)*st.y
+```
+although i don't fully understand cos and sin's effect on these values, i feel like i'm a step closer to understand these functions
+