I’m confused on what the difference between dw/dt & dw/ds is and what exactly is dw? Thanks!

If w=sqrt(x^2+y^2) x=ln(rs+tu) y=t/u(cos(rs))… find dw/dt, dw/ds, dw/dr, dw/du.I’m confused on what the difference between dw/dt & dw/ds is and what exactly is dw? Thanks!

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