How to calculate cos inverse of 0.75 without calculator?
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Cos⁻¹(0.75) ≈ 41.5°
Step-by-step explanation:
Let say x = Cos⁻¹(0.75)
=> x = Cos⁻¹(3/4)
Taking Cos both sides
Cosx = Cos(Cos⁻¹(3/4))
=> Cosx = 3/4
Cosθ = Base / Hypotenuse
Draw a right angle triangle
with Base AB = 3 cm & hypotenuse AC = 4 cm
Now measure angle BAC using Protector
we get x ≈ 41.5° ( between 41 & 42)
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