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y = A sin θ = A sin (ωt + θ

phase angle = θ = ωt + θ

phase of wave = φ = t/T + θ

_{0}) = A sin 2πφ = A sin 2π (t/T + θ_{0}/2π)phase angle = θ = ωt + θ

_{0}phase of wave = φ = t/T + θ

_{0}/2πBut I have another book, a university student physics book (International book), written:

y = A sin (ωt + φ)

phase angle = phase of wave = φ

phase angle = phase of wave = φ

Are there some things wrong with my Indonesian Senior High School books? Or maybe the writers have a purpose that I haven't known yet? Thanks.