Answer :
Differentiating :
y' = 1 + sec^2(x),
cosπ=−1
plug in pi = -1 ,for x:
1 + sec^2(pi) = 1 + (-1)^2
= 2
y' = 1 + sec^2(x),
cosπ=−1
plug in pi = -1 ,for x:
1 + sec^2(pi) = 1 + (-1)^2
= 2