题目

●Ophelia and the Marvelous Boy by Karen Foxlee Type: Fantasy When Ophelia moves to a strange city where it never stops snowing, she discovers a boy locked away for 75 years in a museum. She must help the boy before the Snow Queen freezes the world. Along the way, Ophelia learns how to believe in things she cannot see. Targeted readers: People who like fairy tales would enjoy this book. ●A Hundred Horses by Sarah Lean Type: Mystery The wooden horse Nell brings along during her visits to aunt and cousins is stolen by a girl named Angel. As Nell finds out Angers true identity, a bon 已知角的顶点在原点，始边与轴的非负半轴重合，终边经过点，    且   (1)求的值；   (2)求的值。