1 19. State the amplitude and period of: y = sin(4x) Graph one cycle of the function. 4 20. Use the given graph to state the amplitude and period of the function: m/2 AMA 30/2 21. State the amplitude, period, phase shift, and vertical displacement of the given function: y = = 2sin (+) - 2 Graph one cycle of the function. 22. State the amplitude, period, phase shift, and vertical displacement of the given function: y = cos(2x-) +2 Graph one cycle of the function. 23. Verify the given identity: 2 cos2x-1= 1-2 sinx 24. Verify the given identity: (sinx + cosx) - 1 = 2sinxcosx 1 COSX 25. Verify the given identity: + sinx sinx 1 cost = 2cscx