**A. **The expression for a sine function:

$\overline{){\mathbf{y}}{\mathbf{\left(}}{\mathbf{x}}{\mathbf{\right)}}{\mathbf{=}}{\mathbf{A}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{\left(}}{\mathbf{\omega}}{\mathbf{x}}{\mathbf{\right)}}}$

The angular frequency times position, ωx = 2πxf = 2πx/T

A. For a sine function with amplitude *A*=0.75 and period *T*=10, what is *y*(4)?

B. For a *cosine* function with amplitude *A*=0.75 and period *T*=10, what is *y*(4)?

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