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Danica McKellar

Ellipse:
Use FOIL to easily multiply binomials:
Here’s how you solve logarithms:
Use this trick so you don’t get mixed up when doing matrix transpositions:
What the Pythagorean Theorem is really trying to show you:
Exterior angles of polygons will ALWAYS add up to 360 degrees:
If you’re studying trig, you better get pretty comfortable with circles. Check out this visualization that shows what you’re really looking at when you deal with pi:


This shows the same thing, but a bit more simply:
Here’s how sine and cosine apply to triangles:
Cosine is the derivative of sine:
Tangent lines:
Flipped on its side, the shape begins to make more sense: