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Unit 2: Trigonometric Functions-II
Solution Notes
(i) sin3A =
3
3sinA – 4sin A =
=
=
3
Thus, it is verified that sin3A = 3sinA – 4sin A
(ii) cos3A =
4cos A – 3cosA =
3
=
3
Thus, it is verified that cos3A = 4cos A – 3cosA
(iii) tan 3A =
=
Thus, it is verified that tan 3A =
1. If verify that
(a) (b)
(c)
2. Find the values of
Contd...
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