...
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1 ) if w= f(x) and x=f(t) and t=f(s) find dy/ds
2) Cot(a+_B)=
...
..
1 ) if w= f(x) and x=f(t) and t=f(s) find dy/ds
2) Cot(a+_B)=
(1) y (2)
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