Topic explanation

Standard explanation

y=arccos x means cos y=x with x in [-1,1] and y in [0,pi].

Key points

• arccos definition and graph
• rule
• worked example
• arccos definition and graph: y=arccos x means cos y=x with x in [-1,1] and y in [0,pi].
• CONCEPT AND RULE: y=arccos x means cos y=x with x in [-1,1] and y in [0,pi].
• METHOD: For arccos definition and graph, identify the given information and required result. Select the matc
• y=arccos x means cos y=x with x in [-1,1] and y in [0,pi].
• Worked pattern: arccos(-12)=2pi/3.

Labelled diagram