Question

writing equations for graphs? i need help with two please

here are the graphs
1: http://puu.sh/6tOop.png
2: http://puu.sh/6tOpu.png

these are all trigonometric sine/cosine/tangent functions, i'm just not sure how to do this. please help!

Answer 1

#1 looks like a standard tangent graph

Answer 2

#2 is a tangent graph shifted to right pi and period is 2pi instead of standard pi

--> tan(x/2 - pi/2)