Graphs of Sine and Cosine · Hard problem

$y=-5\cos\!\left(\tfrac{\pi}{4}(x-1)\right)+4$

$y=-5\cos\!\left(\tfrac{4}{\pi}(x-1)\right)+3$

$y=5\cos\!\left(\tfrac{\pi}{4}(x-1)\right)+3$

$y=-5\cos\!\left(\tfrac{\pi}{4}(x-1)\right)+3$