Question

Write the equation of the sinusoidal function shown.

Answer 1

Answer: A

• It looks at though the graph moved down a unit, so definitely a (-1) at the end of the function. If you move the graph up a unit, you will notice that the y = cos x format, therefore, it's not C or D.
• The amplitude of the function is 1. So B and D are out because their amplitudes are 2.

Therefore, the answer is A.