B. 1 / 1
ExplanationStep 1: Recall standard values. Step 2: sin90° = 1 and cos90° = 0 so the value is 1. Step 3: At 90° remember sin is 1 and cos is 0.
Step 1: Standard values याद करें। Step 2: sin90° = 1 और cos90° = 0 इसलिए value 1 है। Step 3: 90° पर sin 1 और cos 0 याद रखें।
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