CBSE Class 12 Mathematics 2026 Main Paper 65/5/3 · Q212 Marksprincipal_values
CBSE Class 12 Mathematics 2026 Main Paper 65/5/3 · Question 21 (Inverse Trigonometric Functions)
Evaluate \(\tan[\cos^{-1}(\tan(3\pi/4))]\).
✅ Step-by-Step Solution
Final Answer: 0.
- The inner tangent is −1.
- The principal inverse cosine of −1 is π.
- Then tan π=0.
📋 CBSE Stepwise Marking Scheme
- [0.5 marks] The inner tangent is −1.
- [1 mark] The principal inverse cosine of −1 is π.
- [0.5 marks] Then tan π=0.
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