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If sin⁻¹x = π/5, what is cos⁻¹x for the same x?
A2π/5
B3π/10
C4π/5
Dπ/10
Answer & Solution
Correct answer: B. 3π/10
Since sin⁻¹x + cos⁻¹x = π/2, cos⁻¹x = π/2 - π/5 = 3π/10.
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