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Drdr2929
@Drdr2929
July 2022
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Помогите пожалуйста решить интеграл:
integral(dx/(4cosx+3sinx))
Решается способом универсальной тригонометрической подстановки.
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sedinalana
Verified answer
Tgx/2=t⇒x=2arctgt .dx=2dt/(1+t²)
sinx=2t/(1+t²),cosx=(1-t²)/(1+t²)
∫dx/(4cosx+3sinx=∫2dt/(4-4t²+6t)=-1/2*∫dt/(t²-3t-1)=-1/2*∫dt/[(t-3/4)²-(5/4)²]=
-1/2*2/5*ln|(t-3/4-5/4)/(t-3/4+5/4)|=-1/5*ln|(t-2)/(t-1/2)|=
=-1/5*ln|(tgx/2-2)/(tgx/2+1/2)|+C=-1/5*ln|(tgx/2-2)/(tgx/2+1/2)|+C
3 votes
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amin07am
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Answers & Comments
Verified answer
Tgx/2=t⇒x=2arctgt .dx=2dt/(1+t²)sinx=2t/(1+t²),cosx=(1-t²)/(1+t²)
∫dx/(4cosx+3sinx=∫2dt/(4-4t²+6t)=-1/2*∫dt/(t²-3t-1)=-1/2*∫dt/[(t-3/4)²-(5/4)²]=
-1/2*2/5*ln|(t-3/4-5/4)/(t-3/4+5/4)|=-1/5*ln|(t-2)/(t-1/2)|=
=-1/5*ln|(tgx/2-2)/(tgx/2+1/2)|+C=-1/5*ln|(tgx/2-2)/(tgx/2+1/2)|+C
Verified answer
Ответ ответ ответ ответ ответ ответ