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ExplanationStep 1: This is a basic trigonometric identity. Step 2: cos²θ + sin²θ is always 1. Step 3: Memorize this identity first.
Step 1: यह basic trigonometric identity है। Step 2: cos²θ + sin²θ हमेशा 1 होता है। Step 3: इस identity को सबसे पहले याद रखें।
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