Question 7 — IGCSE 0580 Oct/Nov 2023 Paper 43
Cambridge IGCSE Mathematics 0580, Extended tier, calculator. Topic: Numbers · Fractions, decimals and percentages. Worth 11 marks.
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Question text
7 (a) Complete the table of values for y = 3cos2x°.
Values are given correct to 1 decimal place.
x 0 10 20 30 40 45 50 60 70 80 90
y 3.0 2.8 2.3 1.5 0.5 -0.5 -2.3 -3.0
[3]
(b) Draw the graph of y = 3cos2x° for 0 G x G 90.
y
3
2
1
0 x
10 20 30 40 50 60 70 80 90
- 1
- 2
- 3
[4]
(c) Use your graph to solve the equation 3cos2x° =-2 for 0 G x G 90.
x = ................................................ [1]
(d) By drawing a suitable straight line, solve the equation 120cos2x° = 80-x for 0 G x G 90.
x = ................................................ [3]
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