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# Simplifying Trig Expressions

SATSTM-1ESOE9

Which one of the following is equivalent to $(\text{1 - sin x})(\text{1 + sin x})$ ?

A

$\text{sin x}$

B

$\text{cos x}$

C

$\text{tan x}$

D

${\sin}^{2}x$

E

${\cos}^{2}x$