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Ans is 4th.
Differentiate each term from right to left and join them with multiplication sign.
Differentiation of (wt-kx) will be -k and Sin(wt-kx) will become Cos(wt-kx)
Differentiate each term from right to left and join them with multiplication sign.
Differentiation of (wt-kx) will be -k and Sin(wt-kx) will become Cos(wt-kx)
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