Use the Fundamental Identities to Find the Value of the Trigonometric

Multiple Choice

Use the fundamental identities to find the value of the trigonometric function.
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$a = 6$
$b = 8$
$c = 5$
$d = 3$
$e = 4$

A) $x = 15$
B) $x = 10$
C) $x = 11$
D) $x = 5$