Choose the letter that corresponds to your answer. If your answer is not amongthe choices, choose E.

1/2 11. If the substitution va = sin y is made in the integrand of dx, the resulting integral V1 - x is 75 / 4 .75 / 4 75 / 4 75 /4 (A) sin y dy (B) 2 siny dy (C) 2 sin y dy (D) J. sin y dy 12. Evaluate: / x'el dr can be best evaluated by which of the following integration technique? (A) integration by algebraic substitution (C) integration ny partial fraction (B) integration by parts (D) integration by trigonometric substitution 13. The definite integral" csc2 x dx equals (A) V3 (B) V3-1 (C) 1 - V3 (D) V3+1 14. Using trigonometric substitution, / x2vx2 - 4 dx is equivalent to which of the following? (A) 16 sin2 0 cos2 0 de (C) 16 sec2 0 tan' 0 de (B) 16 tan2 0 sec3 0 de (D) 16 sec2 0 tan? 0 de