cos^-1 (1/2.+ 2 sin^-1(1/2)
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YBDVHVTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
Step-by-step explanation:
VHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVHVH
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