dy/dx=(2t⁵)'/(t⁶)'=(10t⁴)/(6t⁵)=5/(3t)
d²y/dx²=[d(dy/dx)/dt]/(dx/dt)
=[5/(3t)]'/(6t⁵)
=-5/(18t⁷)
d³y/dx³=[d(d²y/dx²)/dt]/(dx/dt)
=[-5/(18t⁷)]'/(6t⁵)
=[5/(126t⁸)]/(6t⁵)
=(5/756)t⁻¹³
