AM-913

Graphs of sine and cosine

A Math · Secondary 3 · Medium · Graphs of sine and cosine

The function

y=3\cos(2x)-1

is defined for

0^\circ\le x\le360^\circ

. What are the amplitude and period of this graph?

Amplitude $3$ , period $180^\circ$
Amplitude $3$ , period $360^\circ$
Amplitude $2$ , period $180^\circ$
Amplitude $4$ , period $90^\circ$

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