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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 8 - No. 9)

Which of the following equations is equivalent to cos(θ) = Adjacent / Hypotenuse?
θ = cos^-1(Adjacent / Hypotenuse)
θ = sin^-1(Adjacent / Hypotenuse)
θ = tan^-1(Adjacent / Hypotenuse)
θ = cos(Hypotenuse / Adjacent)

توضيح

The inverse cosine function is used to find the angle when the cosine ratio is known.

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