A. 0 / 0
ExplanationStep 1: Check the standard trigonometric table. Step 2: cos90° = 0. Step 3: Remember cos is 1 at 0° and 0 at 90°.
Step 1: Standard trigonometric table देखें। Step 2: cos90° = 0 होता है। Step 3: cos की value 0° पर 1 और 90° पर 0 याद रखें।
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