A. sec² x
ExplanationStep 1: Identify the concept: this is a standard derivative. Step 2: The derivative of tan x is sec² x. Step 3: Remember derivative of tan as sec square.
Step 1: concept पहचानें: यह standard derivative है। Step 2: tan x का derivative sec² x होता है। Step 3: tan derivative को sec square से याद रखें।
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