sin30°＝1/2sin37°＝3/5sin45°＝√2/2sin57°＝4/5sin60°＝√3/2cos30°＝√3/2cos37°＝4/5cos45°＝√2/2cos57°＝3/5cos60°＝1/2tan30°＝√3/3tan37°＝3/4tan45°＝1tan57°＝4/3tan60°＝√3...