Analysis and Approaches for IBDP Maths Ebook 1 | Page 95

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2. Let
tan� �
11
, where � is acute.
5
(a) Find cos� .
(b) Find cos2� .
[3]
[2]
3. Let
4
sin� � , where � is obtuse.
5
(a) Find cos� .
(b) Find sin 2� .
[4]
[2]
4. Let cos� � m , where � is acute. Find expressions for each of the following in terms of
m .
(a) tan� ;
(b) tan 2� .
[3]
[4]
10
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