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y= e^(-tsint)
y' = -(tcost +sint ) .e^(-tsint)
y''
= -[ (-tsint+cost +cost ) - (tcost +sint)^2 ] .e^(-tsint)
=-[ -tsint+2cost - (tcost)^2-2tsint.cost -(sint)^2 ] .e^(-tsint)
=[ tsint -2cost + (tcost)^2 + 2tsint.cost +(sint)^2 ] .e^(-tsint)
y' = -(tcost +sint ) .e^(-tsint)
y''
= -[ (-tsint+cost +cost ) - (tcost +sint)^2 ] .e^(-tsint)
=-[ -tsint+2cost - (tcost)^2-2tsint.cost -(sint)^2 ] .e^(-tsint)
=[ tsint -2cost + (tcost)^2 + 2tsint.cost +(sint)^2 ] .e^(-tsint)
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