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i am going through a solution and there is a part i dont understand<br />
<br />
it gives u = x+y<br />
v = x-y<br />
<br />
then it converts to polar<br />
x=rcosT<br />
y=rsin¿<br />
<br />
so far so good<br />
<br />
but then he derives<br />
<br />
Vr = ucos¿ +vsinT<br />
V¿ = -usin¿ +vcos¿<br />
<br />
how did he get the vr and V¿ ?<br />
<br />
any input would be appreciated.
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i am going through a solution and there is a part i dont understand

it gives u = x+y
v = x-y

then it converts to polar
x=rcosT
y=rsin¿

so far so good

but then he derives

Vr = ucos¿ +vsinT
V¿ = -usin¿ +vcos¿

how did he get the vr and V¿ ?

any input would be appreciated.

question in polar coordinates

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