方程組的解集是________．

函數(shù)y=的單調(diào)增區(qū)間為________．

y=cos(x∈Z)的值域是________

已知sina =，2p＜a ＜3p，那么sin+cos=________

已知sinx=，則sin2(x-)=________

已知0＜a ＜p，sina ·cosa =，則sina -cosa =________

若cos()，且，則cosa =________

若a 、b 均為銳角，且cosa =，cos(a + b )=-，則cosb =________

cos(p-x)=，x∈［-p，p］，則x的值為________

cos(2p-a )·tan(p-a )·tan(+ a )·csc(-a )=________