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