[1] Some traders use very extensive mathematical models to predict price movements (chaos theory, neural networks)
[2] Some use complex but understandable to most college graduates who have taken calculus (intermarket spread relationships, option model pricing)
[3] Some traders use simple-to-moderate math to calculate standard indicators (RSI, Stochastics, <insert your favorite indicator here>), but almost any trading platform you use will have these imbedded.
[4] Some traders use no math at all and study only chart patterns. This also includes candlesticks, point-and-figure charting, etc.
You should also understand the mathematics of risk/rewards, risk-of-ruin, optimal-f and other risk/performance-related parameters.
Math is not that important. Discipline and understanding risk is very important.
Good luck.