题目

It was a rainy morning and the children, mainly boys with various learning difficulties, refused to settle for the start of the lesson. As an inexperienced teacher, I tried every means to get them to be   36  , but in vain. my panic was rising and I could feel my heart beating wildly. This was the   37   of my job as a music teacher, I thought -- teaching was not for me. Then I had an idea. Hoping that no one would notice that I was   38   inside, I threw my voice as far as it would reach: Put your heads on the desks and close your   39  ! We are going on a journey.   4011．在等腰直角△ABC中，∠ACB=90°，P是线段BC上一动点（与点B、C不重合），连接AP，延长BC至点Q，使得CQ=CP，过点Q作QH⊥AP于点H，交AB于点M．（1）若∠PAC=α，求∠AMQ的大小（用含α的式子表示）．（2）用等式表示线段MB与PQ之间的数量关系，并证明．