B. 9 / sqrt(1-81x^2)
ExplanationStep 1: derivative of sin^(-1)u is u'/sqrt(1-u^2). Step 2: here u=9x, so u'=9, answer 9/sqrt(1-81x^2). Step 3: tip: inverse sine derivative has a square-root denominator.
Step 1: derivative of sin^(-1)u = u'/sqrt(1-u^2)। Step 2: u=9x है इसलिए u'=9, answer 9/sqrt(1-81x^2)। Step 3: tip: inverse sine में denominator square root वाला होता है।
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