O-LevelAdditional MathematicsTrigonometry4037/21 · May/June 2017 · Q46 Marks
Given that y = 7 cos 10x – 3, where the angle x is measured in degrees, state the period of y,
- (a)(i)Given that y = 7 cos 10x – 3, where the angle x is measured in degrees, state the period of y,[1]
- (a)(ii)Given that y = 7 cos 10x – 3, where the angle x is measured in degrees, state the amplitude of y.[1]
- (b)[Figure 4.1] Find the equation of the curve shown, in the form y = ag(bx) + c, where g(x) is a trigonometric function and a, b and c are integers to be found.[4]
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Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [B1] 36
- [B1] 7
- [B4] [y =] 5sin 4x + 7 B1 for each of 5, 4 and 7 and B1 for sine Accept a = 5, b = 4, c = 7 for B3
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