Which transformation causes the described change in the graph of the function y = cos x?

Question

anonymous · Answer

The transformation _ results in a horizontal shrink.
A. cos(x/5) B. 9cos(x) C. cos(3x) D. cos(x+2)

The transformation _ results in a vertical stretch.
A. 1/3cos(x) B. cos(x+3) C. cos(-5x) D. -5cos(x)

The transformation _ results in a horizontal stretch.
A. 2/7cos(x) B. -3cos(x) C. cos(7x) D. cos(x/3)

The transformation _ results in a vertical shrink.
A. cos(x-2) B. 2/3cos(x) C. cos(4x) D. 2cos(x)