( W(s, t)=F(u(s, t), v(s, t)) ), where ( F, u ), and ( v ) are differentiable. If ( u(-6,-5)=9, u_{s}(-6,-5)=-3, u_{t}(-6,-5)=-9, v(-6,-5)=-8, v_{s}(-6,-5)=-5 ), ( v_{t}(-6,-5)=-7, F_{u}(9,-8)=6 ), and ( F_{v}(9,-8)=4 ), then find the following: [ egin{array}{l} W_{s}(-6,-5)= \ W_{t}(-6,-5)= end{array} ]
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