If X = 2 Tan θ,Use Trigonometric Substitution to Write $\sqrt { 4 + x ^ { 2 } }$

question 10

Multiple Choice

If x = 2 tan θ,use trigonometric substitution to write $\sqrt { 4 + x ^ { 2 } }$ as a trigonometric function of θ,where $- \frac { \pi } { 2 } < \theta < \frac { \pi } { 2 }$ . ​

• A)​2 csc θ
• B)​2 sec θ
• C)​2 cos θ
• D)​2 tan θ
• E)​2 sin θ

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