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
解释
To find the angle, use the inverse functions (sin^-1, cos^-1, tan^-1).