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Answer:
(b) sin⁻¹
Step-by-step explanation:
The relevant trig function relating angles to sides is ...
Sin = Opposite/Hypotenuse
Here, we have ...
sin(A) = 4/12 = 1/3
A = arcsin(1/30 = sin⁻¹(1/3)
The inverse sine function can be used to find the angle.
