The graph 3 of the function y = cosx is not graphed correctly. Option C is correct.
Graphs of function have been shown in the image. It is to determine which graph is incorrect.
The graph is a demonstration of curves that gives the relationship between the x and y-axis.
Graph 1, 2, and 4 are of y = tanx, y = sinx and y = cotx respectively are correct. And this option can be omitted.
Graph 3 of y = cosx is incorrect because the value of y = cosx is +1 but in the graph the value is -1 and also at c = π the value of function y = cosx is -1 but in the graph the value is +1 which is wrong.
Thus, The graph 3 of the function y = cosx is not graphed correctly. Option C is correct.
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