No one is good at math, they just think they are. Some are better than others.
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.
It could be useful to remember some trig identities or trig values. Though many of the common ones can be memorized through practice.
"Pure mathematics is, in its way, the poetry of logical ideas."
bleh I don't like trig. I will memorise them when I start doing trig. Focusing on algebra right now. Thanks for the tips though.
"School conditions you to reject your own judgement and experiences. The facts are in the textbook. Memorize and follow the rules. What they don't tell you is the people that discovered the facts and wrote the textbooks are people like you and me."