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Oh, It's going to be ##sin(\omega + \pi)## = ##-sin(\omega)## Should I make it ##sin(\omega t + \pi \omega)## = ##-sin(\omega t)## so that φ = ω π, A = 80? But if that's the case, φ depends on ω, and in the second question it gives out: CombinedSound = 100 sin(ω t) + 100 sin(ω t + π + δ) = 20...

Summary:: AmbientNoise + AntiNoise combined calculation I am having trouble with this question: Noise cancelling headphones use both passive (insulated earphones) and active (electronic “anti-noise”) methods to nullify ambient noise. One task of a sound engineer is to design low-energy...