Question: If w = e x c o s y then the value of d e l w d e l x + d e l

If w=excosy then the value of delwdelx+delwdely is
ex(siny+cosy)
ex(siny-cosy)
ex(cosy-siny)
ex(cosy+siny)
If w = e x c o s y then the value of d e l w d e

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