Q. 265.0( 1 Vote )
Mark the Correct alternative in the following:
If 
then cos α =
A.1 – e cos (cos x + e)
B. 
C. 
D. 
Answer :
Given 
, then cos α is
Let
By using the expansion of cos 2x in terms of tan x
We get,
Dividing the numerator and denominator by 
[using the formula for cos 2x in terms of tan x 
]
Hence the answer is option D.
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