A. sec²x / sec²x
ExplanationStep 1: Recall the standard derivative formula. Step 2: Derivative of tan x is sec²x. Step 3: Keep trigonometric derivatives in your formula table.
Step 1: Standard derivative formula याद करें। Step 2: tan x का derivative sec²x होता है। Step 3: Trigonometric derivatives को formula table में रखें।
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