B. pi / 4
ExplanationStep 1: Identify the concept: this is inverse tangent value. Step 2: tan(pi/4)=1 so tan^-1(1)=pi/4. Step 3: Remember tan 45 degree equals 1.
Step 1: concept पहचानें: यह inverse tangent value है। Step 2: tan(pi/4)=1 होता है इसलिए tan^-1(1)=pi/4 है। Step 3: tan 45 degree equals 1 याद रखें।
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