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Find the value of the function f(x) = -cotangent(2x) when x = pi/4

f(x) = - cotangent(2x) when x = pi/4
substitute the value of x
The question ask the value
- cotangent ( 2 ( pi/4 ) ) = ?
Solution:
solving f(x) = cot(2x) when x = pi/4
Therefore, - cotangent ( 2 ( pi/4 ) ) = 0