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Take f(x) = ø - tan^-1(3ø)
Search for a sign change.
f(0) = 0
f(pi/4) = -0.38
f(pi/2) = 0.21
Therefore, the root is between pi/4 and pi/2...
take x1 = pi/4...
I guess now it's easy...
Brother i still did not get u..... how do i do it.... at first i take f(O) = O .... den what ? :/