题目

Smartphone Security Blankets Security—for the information on your smartphone, as well as for the phone itself—is a hot topic these days. The truth is that you’re packing a lot of sensitive information on your phone, and you should keep it safe. When it comes to physical security, iPhone users would do well to download Find My iPhone, a free app (application program) from Apple that allows you to visit a website and see your (lost, stolen or misplaced) phone on a map. You can then sound an alarm, send a message that will pop up on its screen, lock the phone or erase all your da已知函数f(x)=cos2x+2sinxcosx-sin2x.(1)求f(x)的最小正周期和值域;(2)在△ABC中,角A,B,C所对的边分别是a,b,c,若f()=2且a2=bc,试判断△ABC的形状.