BAC2017: first two questions
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theory BAC2017
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imports "../../ontologies/mathex_onto"
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Real
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Deriv Transcendental
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begin
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open_monitor*[exam::MathExam]
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@ -29,14 +29,41 @@ Exercise.content="[q1::Task]"]
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On considère la fonction h définie sur l’intervalle [0..+\<infinity>] par : @{term "h(x) = x * exponent (-x)"}
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*}
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definition h :: "real \<Rightarrow> real"
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where "h x \<equiv> x * exp (- x)"
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subsubsection*[q1::Task, Task.concerns= "{examiner,validator,student}",
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level="oneStar", mark="1::int", type="formal"]
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{* Déterminer la limite de la fonction @{term "h"} en +\<infinity>. *}
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{* Déterminer la limite de la fonction @{term h} en +\<infinity>. *}
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text*[a1::Answer_Formal_Step]
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{* First Step: Fill in term and justification*}
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lemma q1 : "(h \<longlongrightarrow> (0::real)) at_top"
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sorry
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subsubsection*[q2::Task, Task.concerns= "{examiner,validator,student}",
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level="oneStar", mark="1::int", type="formal"]
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{* Étudier les variations de la fonction @{term h} sur l'intervalle [0..+\<infinity>] et dresser son tableau
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de variation} *}
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find_theorems exp
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text*[a2::Answer_Formal_Step]
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{* First Step: Fill in term and justification*}
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lemma q2_a : "DERIV h x :> (1 - x) * exp (- x)"
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proof -
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have * : "DERIV (exp \<circ> uminus) x :> - (exp (-x))"
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by (simp add: has_derivative_minus has_derivative_compose Transcendental.DERIV_exp)
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have ** : "DERIV id x :> 1"
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by (metis DERIV_ident eq_id_iff)
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have *** : "DERIV h x :> x * (- (exp (- x))) + 1 * (exp (- x))"
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by (simp add: * ** has_derivative_mult)
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show ?thesis
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by (metis "***" left_diff_distrib mult_minus_right uminus_add_conv_diff)
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qed
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close_monitor*[exam]
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