Which Transformation Was Not Performed on Y=cos X $y=-4 \cos (2 x+\pi / 3) ?$

question 65

Multiple Choice

Which transformation was not performed on y=cos x to obtain $y=-4 \cos (2 x+\pi / 3) ?$

• A) Vertical stretch by a factor of 4
• B) Horizontal stretch by a factor of 2
• C) Horizontal shift left by \(\pi / 6\) units
• D) Reflection through the x -axis.