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Finding derivative with fundamental theorem of calculus: chain rule


F, left parenthesis, x, right parenthesis, equals, integral, start subscript, 0, end subscript, start superscript, x, start superscript, 4, end superscript, end superscript, cosine, left parenthesis, t, right parenthesis, d, t
F, prime, left parenthesis, x, right parenthesis, equals