Answer:
-cos(x)
Explanation:
y¹ = cos(x)
y² = -sin(x)
y³ = -cos(x)
y⁴ = sin(x)
Every 4th derivative is sin(x)
123 = 4(30) + 3
y¹²⁰ = sin(x)
y¹²¹ = cos(x)
y¹²² = -sin(x)
y¹²³ = -cos(x)
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