A. 0
ExplanationStep 1: Identify the concept: this is inverse cosine value. Step 2: cos 0 = 1 so cos^-1(1)=0. Step 3: Remember principal range of inverse cosine is 0 to pi.
Step 1: concept पहचानें: यह inverse cosine value है। Step 2: cos 0 = 1 होता है इसलिए cos^-1(1)=0 है। Step 3: cos inverse की principal range 0 से pi तक याद रखें।
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