CBSE Class 12-science Answered
Could you please provide complete solution to the following question?
Asked by | 24 Jun, 2008, 08:47: PM
Expert Answer
we'll use cos3A = 4cos3A - 3cosA
multiply and divide by cos9
so we get
(4cos3 9 - 3cos9)(4cos227°-3) / cos9
=cos27(4cos227°-3) / cos9
= (4cos3 27 - 3cos27) / cos9
=cos81 / cos9
= sin 9 / cos9
= tan9
Answered by | 17 Dec, 2008, 12:01: AM
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