NDA Math Indefinite Integrals

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For the next two (2) items that follow :
The integral
dx
acosx+bsinx
is of the form
1
r
l
n
[tan(
x+α
2
)
]
[NDA I 2015]
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Question : 32 of 38
 
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What is α equal to?
[NDA I 2015]
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