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y[1]=A*cos(2pi(t/T-x/λ),y[2]=A*cos(2pi(t/T +x/λ),y[1]+y[2]=A*cos(2pi(t/T-x/λ))+A*cos(2pi(t/T +x/λ)y[1]+y[2]=A(cos((2πt)/T - (2πx)/λ)+cos((2πt)/T + (2 π x)/λ))y[1]+y[2]=A(2cos((2πt)/T) cos((2πx)/λ))y[1]+y[2]=2A(cos((2πt)/T) cos((2πx)/λ))
y[1]=A*cos(2pi(t/T-x/λ),
y[2]=A*cos(2pi(t/T +x/λ),
y[1]+y[2]=A*cos(2pi(t/T-x/λ))+A*cos(2pi(t/T +x/λ)
y[1]+y[2]=A(cos((2πt)/T - (2πx)/λ)+cos((2πt)/T + (2 π x)/λ))
y[1]+y[2]=A(2cos((2πt)/T) cos((2πx)/λ))
y[1]+y[2]=2A(cos((2πt)/T) cos((2πx)/λ))
