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TRIDIB SAHA

· started a discussion

· 1 Months ago

Please give a proper view of question 60 . Unable to understand this question from the view given. (Question: 233158.0 )

Please give a proper view of question 60 . Unable to understand this question from the view given.

Question:

If \(\theta\) is a positive acute angle and tan 2\(\theta\) tan 3\(\theta\) = 1, then the value of \(\left ( 2\ cos^2\cfrac {5\theta}{2}-1 \right )\) is :


Options:
A)

\(-\cfrac{1}{2}\)

B) 1
C) 0
D) \(\cfrac{1}{2}\)
Solution:

Ans: (c)

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