trigonometry (sin,cos,tan)

match the follow items.

1. sinθ/cosθ
2.sin^2θ+cos^2θ
3.sin(90degree -θ)
4.cos(90degree -θ)
5.tan(90degree -θ)

A.cosθ
B.sinθ
C.tanθ
D.1
E.1/tanθ

1.___ 2.___ 3.___ 4.___ 5.___