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CBSE · Class 10 · Mathematics
Sample question · Sample · 3 of 10
Chapter: Trigonometry · Difficulty: Medium
If sin θ = 3/5 and θ is an acute angle, what is the value of cos θ?
- A3/4
- 4/5Correct
- C5/4
- D4/3
Why this is correct
sin²θ + cos²θ = 1, so cos²θ = 1 − 9/25 = 16/25. θ is acute, so cos θ = 4/5.
Topic mastery
Trigonometry
44%61%
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Class 9 · Mathematics
56% mastered
AI recommendation
Next session: 15 Quadratic Equations questions
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Mathematics · Class 9
Q. If 2x + 5 = 17, what is the value of x?
AI DIAGNOSIS
You added 5 instead of subtracting it. Same slip appeared in 3 earlier linear equations. Next question targets exactly that step.
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THIS WEEK
THE REAL PRODUCT
See what students, parents and teachers actually get.
Mastery, streaks, subject accuracy and badges in one view.
Hey Aarav
Here's your week at a glance.
This week
5-day streak- Monday: practised
- Tuesday: practised
- Wednesday: practised
- Thursday: practised
- Friday: practised
- SSaturday: not yet
- SSunday: not yet
Subject accuracy
- Mathematics88%
- Physics74%
- Chemistry81%
- Biology69%
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You missed 2 questions on Fractions. Want a quick explanation?
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Aarav Mehta
Class 9A · Weekly progress report
This week
+6%
Questions
142
Sessions
5
Subject accuracy
Focus topics
- Trigonometry61%
- Quadratic Equations38%
AI recommendation
Next session: 15 Quadratic Equations questions, then a Trigonometry recap.
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