Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 47)
What is the meaning of the 'inverse' key on the calculator when solving a trigonometry problem?
To find the ratio of two sides
To find the angle
To find the side
All of the above
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To find the angle, use the inverse functions (sin^-1, cos^-1, tan^-1).