Scheme (Merged) Thursday 22 May 2025 [VERIFIED]
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
1 The equation x2 4x c 0 has non‑ real roots.
Find the range of possible values of c
Circle your answer.
[1 mark]
c4 c4 c4 c4
2 The point A on the Argand diagram represents the complex number z
The point B is the reflection in the imaginary axis of the point A
Im
O Re
A B
Which complex number does the point B represent?
Circle your answer.
[1 mark]
1
z z z
z
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,3
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outside the
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, 4
Do not write
outside the
3 Which one of the following expressions cannot be evaluated by l’Hôpital’s rule? box
Circle your answer.
[1 mark]
x x2 tanh x ex 1
lim lim lim lim
x 0 cos x x 0 sin x x 0 2x x 0 ln 1 x
4 Which one of the following statements is always correct?
Tick ( ) one box.
[1 mark]
1
sinh2 x 1 cosh 2x
2
sech2 x tanh2 x 1
cosech2 x coth2 x 1
1
cosh2 x (cosh 2x 1)
2
Turn over for the next question
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