Oustad
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The BAC 2027 revision app, for 3AS students

You sit down to study and don’t know where to start? Your programme is ready.

Tell it your track. Every subject of the official syllabus becomes a path of steps, in class order. Each day you pick up where you stopped, and everything is corrected step by step.

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Pick your track, answer a few questions, and your programme is ready in two minutes.

Install it, pick your track, answer a few questions, and your programme is ready in two minutes.

Mathematics 3

الاشتقاقية و الاستمرارية على مجال

Today 1 Lesson · ~8 min

اشتقاق الدوال المركبة و خاصة √f و المثلثية

Start

2/5 steps done

  • 100% Algerian
  • 10,000+ students signed up
  • Free every day

Also on iPhone and Android. App Store Google Play

You know these evenings.

  • 21:00. You open your phone for one thing, and the evening is gone.

  • You spend the evening picking what to revise instead of revising.

  • You sat through the lesson. Alone with the exercise, nothing comes.

  • What you finished in October is gone by March. You find out in June.

The problem was never you.

Picking what to study, then correcting your own work, alone, for nine months. Nobody does that job well.

Your programme shows you what to study today. The correction starts from what you wrote.

  1. 1

    Tell it your track

    One tap on your track, and Oustad lays out every subject of the official syllabus, chapter by chapter, in the order you study it in class.

  2. 2

    Today’s step is ready

    Each step is a short lesson, about 6 minutes, one idea per screen. Your programme shows you today’s step, and when a lesson starts to fade, it brings it back and tells you.

  3. 3

    Answer first, correct after

    In Review, the quiz corrects every answer and tells you why. For an exercise, you hand in your paper, then the correction walks step by step through what you wrote.

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Try it on real content

Lessons, exercises and the quiz, all of it from your track’s official syllabus.

Physics · Projectile motion

نُسمّي أعلى ارتفاع يبلغه المقذوف السهم zS=v02sin2α2g، والمسافة الأفقية التي يقطعها عند عودته إلى ارتفاع الانطلاق المدى xP=v02sin(2α)g.

عند سرعة ابتدائية ثابتة، يتحقق أقصى مدى عند α=45°، لأن sin(2α) يبلغ قيمته العظمى.

v0=20 m/s و g=10 m/s2

Peak10.0 m Range34.6 m
z x 30°
30°

Move the slider and watch the curve

Maths · Oblique asymptote

لتكن الدالة f المعرفة على ℝ \ {1} بـ f(x) = x2 - x + 2x - 1.

The question 2 pts

بيّن أنه من أجل كل x من Df: f(x) = x + 2x-1

The correction
  1. 1 نجري القسمة الإقليدية لكثيرة الحدود x2 - x + 2 على x - 1.
  2. 2 نلاحظ أن x × (x - 1) = x2 - x، ومنه x2 - x + 2 = x(x-1) + 2.
  3. 3 نقسم الطرفين على x - 1: f(x) = x(x-1)x-1 + 2x-1 = x + 2x-1
  4. 4 وهو المطلوب.
Maths · Direction of variation

لتكن f دالة معرفة على ℝ حيث f'(x) = (x-1)(x+2). ما هو اتجاه تغير f على المجال ]-2, 1[؟

Pick an answer to try it
Maths · Differentiation
Photo from the notebook
سلسلة تمارين · الاشتقاق

نعتبر الدالة f المعرفة بـ f(x) = √cos(2x) + 2.

بيّن أن f قابلة للاشتقاق على ℝ، ثم عيّن f'(x).

Reading
Solved step by step
  1. 1 نضع u(x) = cos(2x) + 2، ومنه u'(x) = -2sin(2x).
  2. 2 نطبّق صيغة اشتقاق الجذر: f'(x) = u'(x)2√u(x) = -2sin(2x)2√cos(2x) + 2
  3. 3 وبتبسيط الكسر: f'(x) = -sin(2x)√cos(2x) + 2

Snapping an exercise comes with the subscription. See pricing

What changes for you

  • Be wrong where nobody sees

    Nothing is marked while you work, and there is no mark out of 20.

  • Know where you stand

    Your level per lesson in five words: not started, seen, practised, solid, mastered.

  • Your track’s syllabus, in order

    No leak rumours, nothing off-syllabus.

The subjects, and which ones are ready

Everything follows your track’s official programme, in the order it is taught.

Pick your track when you sign up and Oustad shows you what is ready for you.

  • Mathematics Available
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  • Natural sciences Available
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  • Philosophy Available
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  • Economics and management Coming soon
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  • 10,000+ students with us since December 2025
  • 700+ lessons built on the official syllabus
  • 2008 → 2026 BAC sessions that validate the content

Questions students ask

Is it really free?

Yes. Every day you get 3 free energy, each lesson, quiz or exercise takes 1. Your mistakes and the warm-up stay free. Nothing to pay to start. The subscription is there for heavier use and for what costs us money, like snapping an exercise from your own notebook.

See the subscription →
How much time does it take?

One step of the programme is a lesson of about 6 minutes, and a quiz is 8 questions. Every day you get 3 free energy, each new lesson, quiz or exercise takes 1. Your mistakes and the warm-up cost nothing. No fixed schedule, you do what your time allows.

Do I need a bank card?

No. CCP or BaridiMob, you photograph the receipt and send it, and your account opens. Someone else can also pay for you with your link.

How paying works →
I revise on my own. Does it work for me?

That is exactly what it was built for. Your track’s programme, step by step, and every day it shows you what to study, with nobody behind you.

Know what to study tonight.

Free every day, and nobody sees you get it wrong.

Set up my programme Get the app Get the app

Also on iPhone and Android. App Store Google Play