Book: Mathematics Part-II
Chapter: 7. Integrals
Subject: Maths - Class 12th
Q. No. 12 of Exercise 7.9
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12
Evaluate 
Let I = 
cos 2x = 2cos2x – 1
cos2x = 
putting the value cos2x in I
⇒ I = 
[
]
⇒ I = 
⇒ I = 
= π/4
∴ 
= π/4
14
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