A transverse wave of amplitude 0.5 m and wavelength 1 m and frequency 2 Hz is propagating in a string in the negative x-direction. The expression for this wave is 

(1) y(x,t)=0.5sin(2πx4πt)

(2) y(x,t)=0.5cos(2πx+4πt)

(3) y(x,t)=0.5sin(πx2πt)

(4) y(x,t)=0.5cos(2πx+2πt)

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