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Y -Answer::-      t{:[(1)/(L)L_(1)=11+3cos(2theta)],[L_(2)=7+2cos(2theta)],[M=11 cos theta],[W(j_(1),i_(2),theta)=(1)/(2)L_(1)l_(1)^(2)+(1)/(2)L_(2)lambda_(2)^(2)+MI_(2)],[=(1)/(2)(11+3cos 2theta)(0.7)^(2)+(1)/(2)[7+2cos(2theta)](0.8)^(2)+],[=0.245(11+3cos 2theta)+0.32(7+2cos 2theta)],[+6.16 cos theta.],[(del Wf)/(del theta)=-6xx0.245 sin 2*theta-[0.32 xx2xx2sin 2theta]],[+1-6.16 sin theta)]:}(a)lambda_(F)=-1.47 sin 2theta-1.28 sin 2theta-6.1 ... See the full answer