The fundamental Pythagorean identity states $\sin^2\theta + \cos^2\theta = 1$ for all values of $\theta$. This follows directly from the Pythagorean theorem applied to the unit circle.
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JEE Main 2025 — Mathematics Trigonometry
medium
mcq
2025
Official previous-year question
Verified 30 May 2026.
Question
The value of $\sin^2\theta + \cos^2\theta$ is:
Options
- A
$1$
- B
$0$
- C
$\sin(2\theta)$
- D
$2$
Solution
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