4st(s-t)-6s*(t-t*)-3t*(2s*-s)+2st(s-t)
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We have : 4st ( s - t ) - 6s2 ( t - t2 ) - 3t2 ( 2s2 - s ) + 2 st2 ( s - t ) , So
⇒4s2t −4st2 − 6s2t +6s2t2 − 6s2t2 +3st2 + 2s2t2 −2s t3
⇒− 2s2t −st2 + 2s2t2 −2s t3
⇒s t (− 2s −t + 2st−2 t2)
⇒s t ( 2st− 2s −2 t2−t ) ( Ans )
⇒4s2t −4st2 − 6s2t +6s2t2 − 6s2t2 +3st2 + 2s2t2 −2s t3
⇒− 2s2t −st2 + 2s2t2 −2s t3
⇒s t (− 2s −t + 2st−2 t2)
⇒s t ( 2st− 2s −2 t2−t ) ( Ans )
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