Hi, I'm looking for good textbooks or problem books for a 9 and 10th grade students. Maybe not as difficult as the AMC or IMO level math, but some problems that require some thought rather than just plug and chug formulas. For example, I want to find a good problem set for trig proofs, and some of the textbooks I am looking in only have a few problems or none of them are too hard (i.e. they involve 2 steps at most). This is mainly for Euclidean geometry, Algebra 1 and 2 and Trig.