Question

Find the value of Cos 2 alpha when
(i) cos alpha =15/17,
(ii)sin alpha =4/5,
(iii) tan alpha =5/12​

say answer with solution

Answer 1

Answer:

cos 2 alpha=1-2sin2alpha

=1-2×4/5×4/5

=1-32/5

=-27/5

Answer 2

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