Question

Using the formula
ormula of. Sol. Given
SI
+2.2.6-sina) - 3 - 4 sin3d.
sina - sino - sin3a = - * sinza
Now. tan
in converting trigonomer
3 into trigon
Type III. Problems based on convert
of nA. where n is an integer other the
ratio of A:
metrical ratio of nA in
Working Rule :
First of all express the trigonometrical ratio
trigonometrical ratio of 2A and 3A and then
ratio of 2A and 3A in the trigonometric8al ratio of A :
inal ratio of 2A and 3A and then convert the trio
Ex. 13. Show that, cos5A = 16cos A - 20cos A + 5cosA​

Answer 1

Answer:

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