Can
5. (a) Find the expansion of cos(x + y) and cos(x – y). Show that cos(x + y) cos(x - y)
...
Mathematics, 24.10.2021 21:50 timttimtim
Can
5. (a) Find the expansion of cos(x + y) and cos(x – y). Show that cos(x + y) cos(x - y)
be written as cos x - sin?
y.
(5 marks)
(b) Hence, from part (a) and without using the calculator, find the value of
cos(75°) cos (15°), where x and y are special angles.
(5 marks)
Answers: 3
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