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+clear
+//
+//this is a derivation by substitution problem
+//al1=al0/(1+al0*t1)
+//al2=al0/(1+al0*t2)
+//where t1 and t2 are different temperatures al0,al1 and al2 are temperature coefficients
+//substitute al0 in al2
+//on deriving and solving for al2 we get,
+printf("\n al2=al1/(1+al1*(t1-t2))")