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Use a change of variables to evaluate the following integral. - sec 39w tan 39w dw What is the best choice of u for the change of variables? O A. u= sec w O B. u= secwtanw O C. U=W O D. U= 39w O E. u = sec 39w tan 39w OF. u = tan 39w Find du. du = dw Rewrite the given integral using this change of variables. - sec 39w tan 39w dw = | (D du Find the indefinite integral.Use geometry (not Riemann sums) to evaluate the definite integral. Sketch the graph of the integrand, show the region in question, and interpret your result. (3x + 6)dx . 4 Choose the correct graph below. O A. OB. O C. OD. Ay K - - The value of the definite integral (3x + 6)dx as determined by the area under the graph of the integrand is -4 (Type an integer or a decimal.)