Which equation can be used to solve for x in the triangle below?

Using the cosine theorem we have:
 C ^ 2 = A ^ 2 + B ^ 2 - 2 * A * B * cos (theta)
 Substituting values we have:
 x ^ 2 = 4 ^ 2 + 4.7 ^ 2 - 2 * 4 * 4.7 * cos (41)
 
 The equation to solve for x is:
 x ^ 2 = 4 ^ 2 + 4.7 ^ 2 - 2 * 4 * 4.7 * cos (41)
 option 3

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