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$10.$

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For each of the indefinite integrals below, choose which of the following substitutions would be most helpful in evaluating the integral. Enter the appropriate letter $($A$,$B$,$ or C$)$ in each blank. DO NOT EVALUATE THE INTEGRALS.

A$.x=2tan$

B$.x=2sin$

C$.x=2sec$

$1.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\sqrt[\phantom{2}]{x^2-4}dx$

$2.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{(4-x^2{)}^{\frac{3}{2}}}$

$3.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}{x}^2\sqrt[\phantom{2}]{4x^2}dx$

$4.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(x^2-4{)}^{\frac{5}{2}}dx$

$5.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{(4x^2{)}^3}$

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