Back to Periodic and Sinusoidal Functions
Graphs of y = sin x and y = cos x
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Learn it y = sin x starts at 0, rises to 1 at 90°, back to 0 at 180°, −1 at 270° and 0 at 360°. y = cos x starts at its maximum 1. Both have period 360° (2π), amplitude 1 and axis y = 0.
Example: Where does y = cos x reach its minimum between 0° and 360°?
- cos x = −1 at x = 180°.
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