This is a cosine graph with an amplitude of $2$ and shifted up $3$ units.
Begin by sketching the midline at $y = 3$, then boundary lines $2$ units above and $2$ units below the midline.

The function is vertically reflected and has a period of $2π/2 = π$, so sketch an inverted cosine function with the correct period in between the boundary lines.

This is a sine graph with an amplitude of $3$ and shifted down $1$ unit.
Begin by sketching the midline at $y = −1$, then boundary lines $3$ units above and $2$ units below the midline.

The period of the function is unchanged from the parent function, but this curve is shifted $π$ units to the right.