C. pi / 2
ExplanationStep 1: Identify the concept: this is inverse cosine value. Step 2: cos(pi/2)=0 so cos^-1(0)=pi/2. Step 3: Remember cos 90 degree equals zero.
Step 1: concept पहचानें: यह inverse cosine value है। Step 2: cos(pi/2)=0 होता है इसलिए cos^-1(0)=pi/2 है। Step 3: cos 90 degree equals zero याद रखें।
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