Post-UTME Mathematics 2018 Objective — Question 3
Question 3 of 20 from the Post-UTME Screening (Post-UTME) Mathematics 2018 Objective paper, with the correct answer and a full explanation.
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Which of the following is the sketch of the graph of y = cos(theta) degrees?
- A. Sketch A
- B. Sketch B
- C. Sketch CCorrect
- D. Sketch D
Explanation
The cosine curve starts at its maximum value (y=1) when theta=0, falls to -1 at theta=180 degrees, and returns to 1 at theta=360 degrees - unlike a sine curve which starts at 0. Of the four printed sketches, the one beginning at the peak (y=1) at theta=0 is the correct graph of y=cos(theta).
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