Hi,

I hope someone can help. I'm trying to "simplify" y=√2sin(π(x-2.25)) to sinπx - cosπx.

I found the steps online:

line 1 - y=√2sin(π(x-2.25))

line 2 - y=√2sin(πx-2.25pi)

line 3 - y=√2sin(sinπxcos2.25π-sin2.25picosπx)

line 4 - y=√2sin(sinπxcos(2pi+(pi/4)) - sin(2π+(π/4))cospix)

line 5 - y=√2sin((1/√2)sinπx - (1/√2)cospix)

line 6 - sinπx - cosπx

I understand the steps entirely up until and not including line 5. Could someone please explain this to me? I would really appreciate it!