A. sec^2 x
ExplanationStep 1: Identify the concept: this is trigonometric derivative. Step 2: The derivative of tan x is sec^2 x. Step 3: Remember tan derivative equals sec square.
Step 1: concept पहचानें: यह trigonometric derivative है। Step 2: tan x का derivative sec^2 x होता है। Step 3: tan derivative equals sec square याद रखें।
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