A. [0,π]
ExplanationStep 1: Identify range. Step 2: The principal range of cos⁻¹ x is from 0 to π. so the correct option follows. Step 3: In exam questions apply the formula first.
Step 1: range पहचानें। Step 2: cos⁻¹ x की principal range 0 से π तक होती है। इसलिए सही विकल्प मिलता है। Step 3: ऐसे प्रश्नों में पहले सूत्र लगाएँ।
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