Use the Trigonometric Substitution U = a Sin θ,Where - $\sqrt { a ^ { 2 } - u ^ { 2 } }$

question 54

Multiple Choice

Use the trigonometric substitution u = a sin θ,where - π/2 < θ < π/2 and a > 0 to simplify the expression $\sqrt { a ^ { 2 } - u ^ { 2 } }$ . ​

• A)​a csc θ
• B)​a sin θ
• C)​a tan θ
• D)​a cos θ
• E)​- a cos θ

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