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Prashant kumar
In the given question the wave is going to +ive x direction. therefore the sign b/w wt and kx should be - i.e. (wt-kx) not (wt+kx). To check your answer try to find velocity form these quantities from first you will find positive value of velocity and from second you will find negative value of velocity. positive value of velocity means positive x-dirn going wave and negative velocity means wave is travelling to negative dirn of x.