You can put this solution on YOUR website! what is the value of cot 0
cot = 1/tan
tan(0) = 0
cot = 1/0 --> infinity or undefined.
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and sec -15pi/7?
-15pi/7 = -2pi - pi/7
sec(-x) = sec(s) --> sec(pi/7)
sec(pi/7) = 1/cos(pi/7)
I would use a calculator.
