Graphs of Sine and Cosine · Hard problem

$y=5\cos\!\left(\tfrac{\pi}{2}(x-1)\right)-2$

$y=5\cos\!\left(\tfrac{\pi}{2}(x-1)\right)+2$

$y=5\cos\!\left(\tfrac{\pi}{2}(x-1)\right)+3$

$y=5\cos\!\left(\tfrac{2}{\pi}(x-1)\right)+2$