How Do Time Domain Representations Compare in DSB-SC Modulation?

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erece
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the 2 signals shown are used for modulating ( DSB-SC) a carrier with frequency fc.
Now i need to find the similarities and differences between their time domain representation.
Clearly the both will have same envelope. Now i tried for the difference part but could not find it. One possibility according to me can be the phase change at t=1. Can we find that what will be the phase change for both modulated signals at t =1 without drawing the actual plot ?
 

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