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

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

In order to get credit for this problem all answers must be correct.