Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 31)
What are the most important items to remember when starting to solve the trigonometric ratios?
Ensure the calculator is set to degrees.
Decide which formula to use.
Draw and label the sides
All of the above
Explication
All options are relevant to solving the trig ratios.