What does “Pythagorean identity” actually mean in Trigonometry, and why does it matter for JEE?
for any angle, sin²θ + cos²θ = 1.
In simple words: for any angle, sin²θ + cos²θ = 1. Getting Pythagorean identity clear matters because JEE questions on Trigonometry usually test this idea directly, not just a formula you memorised.
Key point
Pythagorean identity
Common mistake
misremembering it as sinθ + cosθ = 1.
Memory tip
it's the SQUARES that add to 1, from the unit circle.
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