Q. 31
Mark the Correct alternative in the following:
The value of 
is
A.cot 3x
B. 2 cot 3x
C. tan 3x
D. 3 tan 3x
Answer :
Given expression is 
[using 
and 
]
Then
[ using a2 – b2 = (a-b)(a+b)]
[using 
formula ]
= tan 3x
Therefore 
The answer is option C.
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