Question: If you do not know what substitution to make, try reducing the integral step by step, using a trial substitution to simplify the integral a

If you do not know what substitution to make, try reducing the integral step by step, using a trial substitution to simplify the integral a bit and then another to simplify it some more. You will see what we mean if you try the sequences of substitution. J 18 tanx sec x (2 + tanx) -dx

a. u = tan x, followed by y = v³, then by w = 2 + v

b. u = tan³ x, followed by v = 2 + u

c. u = 2 + tan³ x

J 18 tanx sec x (2 + tanx) -dx

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