Derivative of \( \displaystyle \sqrt{1 - x^{2}} + \operatorname{asin}{\left(x \right)} \)
Problem 2.1890 · hard
Differentiate \( \displaystyle f(x) = \sqrt{1 - x^{2}} + \operatorname{asin}{\left(x \right)} \).
- \[ \frac{d}{d x} \left(\sqrt{1 - x^{2}} + \operatorname{asin}{\left(x \right)}\right) \]sumStart with the derivative of the sum.✓ Proved
- \[ = \frac{d}{d x} \sqrt{1 - x^{2}} + \frac{d}{d x} \operatorname{asin}{\left(x \right)} \]sum rewriteApply the sum rule. Rewrite the square root as a fractional power.✓ Proved
- \[ = \frac{d}{d x} \operatorname{asin}{\left(x \right)} + \frac{\frac{d}{d x} \left(1 - x^{2}\right)}{2 \sqrt{1 - x^{2}}} \]chainApply the chain rule to the first term.✓ Proved
- \[ = \frac{d}{d x} \operatorname{asin}{\left(x \right)} + \frac{\frac{d}{d x} \left(- x^{2}\right)}{2 \sqrt{1 - x^{2}}} \]constantSeparate the constant term.✓ Proved
- \[ = - \frac{x}{\sqrt{1 - x^{2}}} + \frac{d}{d x} \operatorname{asin}{\left(x \right)} \]power algebraDifferentiate the power term. Simplify the coefficients.✓ Proved
- \[ = - \frac{x}{\sqrt{1 - x^{2}}} + \frac{1}{\sqrt{1 - x^{2}}} \]derivative algebraDifferentiate the inverse sine term. Rewrite the negative exponent.✓ Proved
- \[ = \frac{1 - x}{\sqrt{1 - x^{2}}} \]simplifyCombine the fractions.✓ Proved
Answer \( \frac{1 - x}{\sqrt{1 - x^{2}}} \)
✓ Nihil obstat Every line of this solution was proved by the computer algebra system SymPy. The answer was also checked a second way, without looking at the solution. Reviewers found nothing wrong with the explanation.
The full receipt
| Line | Status | Checked by | Detail |
|---|---|---|---|
| 1 | ✓ Proved | sympy 1.14.0 | line 1 is the problem as stated |
| 2 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] |
| 3 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] |
| 4 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] undefined where 1 - x**2 = 0 |
| 5 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] undefined where 1 - x**2 = 0 |
| 6 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] undefined where 1 - x**2 = 0 |
| 7 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] undefined where 1 - x**2 = 0 |
| 8 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 asin is real only on [-1, 1] undefined where 1 - x**2 = 0 |
| 9 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 undefined where 1 - x**2 = 0 |
| 10 | ✓ Proved | sympy 1.14.0 | simplify(a - b) reduced to 0 undefined where 1 - x**2 = 0 |
| answer | ✓ Proved | sympy 1.14.0 | final line against the stated answer: simplify(a - b) reduced to 0 undefined where 1 - x**2 = 0 |
| answer, a second way | ✓ Proved | sympy 1.14.0 | SymPy differentiated f directly and got the stated answer |
Reviewers
gpt-oss:20b: passqwen3.6:27b-mlx: pass
Every verdict on record (4)
qwen3.6:27b-mlx: pass 2026-10-09gpt-oss:20b: pass 2026-10-09qwen3.6:27b-mlx: pass 2026-10-09gpt-oss:20b: pass 2026-10-09
Proved: SymPy reduced the difference between the two sides to zero. Checked independently: a separate
method, named above, confirmed it. Checked numerically: the two sides agree at every sampled point, which is evidence,
not proof. Reviewed: a model or a person read it; that is all a sentence can have. Solution by
gemma4:26b, checked 2026-10-09 with SymPy 1.14.0.