With all of this said, the derivative of a function measures the slope of the plot of a function. If we examine the graphs of the sine and cosine side by side, it should be clear that the latter appears to accurately describe the slope of the former, and indeed this is true. {{CMD_42}} {{ENV_43}} {{COMMENT_44}} {{COMMENT_45}} {{COMMENT_46}} {{COMMENT_47}} {{COMMENT_48}} {{COMMENT_49}} {{CMD_50}}