For each trigonometric expression in the lefthand column, choose the expression from the righthand column that completes a fundamental identity. Enter the appropriate letter (A,B,C,D, or E) in each blank.

 1 $\sec^2 (x)$ 2 $1$ 3 $\cot(x)$ 4 $1-\cos^2 (x)$ 5 $\tan(x)$

A. $\sin^2 (x)$
B. $\tan^2 (x) + 1$
C. $\displaystyle\frac{\sin (x)}{\cos (x)}$
D. $\displaystyle \frac{\cos (x)}{\sin(x)}$
E. $\sin^2 (x) +\cos^2 (x)$

Your overall score for this problem is