✓ 1 MARKS
MCQ
🔥 APPEARED IN 3 BOARD SETS
Derivative of $\cos^{-1} \left( \frac{\sin x + \cos x}{\sqrt{2}} \right)$, $-\frac{\pi}{4} < x < \frac{\pi}{4}$ with respect to x is :
A
$-1$
B
1
C
$\frac{\pi}{4}$
D
$-\frac{\pi}{4}$
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 65-5 | Set 1 | Question 8 |
| CBSE 2026 | Series 65-5 | Set 2 | Question 9 |
| CBSE 2026 | Series 65-5 | Set 3 | Question 17 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)