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**Simple wave problem**

Hi guys!

I'm trying to solve a wave problem for homework and I hope that I can extract all data, once I have my wave function in the form: y(x,t)=A*sin(kx-wt) . The simple problem is to convert the given data: y(x,t)=4.2*cos(0.2x)*sin(300t) into the above form :uhh: . It seems that I've forgotten mathematics at all!! Can you please show me how such a conversion works, because when I tried the f-la for sin(a)*cos(b) I obtain two sin()s when I need only one.

It is later asked for the wavelength, frequency, speed, etc. But I hope I can solve this with the "proper stated" wave function.

Thanks in advance!

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