Q. 37
Mark the Correct alternative in the following:
If 
then cos 2α is equal to
A.sin 2β
B. sin 4β
C. sin 3β
D. cos 2β
Answer :
Given 
and 
Now to find the value of cos 2α
[By using 
]
[as 
is given]
Hence 
The same value is obtained for sin 4β.
[By sin 2x = 2 sinx cosx]
[using 
and 
]
We have
As 
As the value of cos 2α and sin 4α are the same, the answer is option B.
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