Sketch a unit circle. In your circle, sketch in an angle that has: 7-63 HW eTool (Desmos).
A positive cosine and a negative sine.
A sine of
A negative cosine and a negative sine.
A cosine of about
and a sine of about .
Could an angle have a sine equal to
and cosine equal to ? Give an angle or explain why not.
Use the eTool below to explore these ideas.
Click the link at right for the full version of the eTool: CCA2 7-63 HW eTool