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If plambda^4+qlambda^3+rlambda^2+slambda...

If `plambda^4+qlambda^3+rlambda^2+slambda+t=|[lambda^2+3lambda, lambda-1, lambda+3] , [lambda^2+1, 2-lambda, lambda-3] , [lambda^2-3, lambda+4, 3lambda]|` then `t=`

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Since given relation is an identity it is true for all real values of `lambda`
` |{:(0,,-1,,3),(1 ,,0,,-4),(-3,,4,,0):}|`
which is skew- symmetric determinant.
So t=0
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