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F(x) = int (sec²x - 3) dx
F(x) = tan(x) - 3x + C
untuk titik (π/4 , 2-3/4π), maka
F(π/4) = 2 - 3/4 π
tan(π/4) - 3(π/4) + C = 2 - 3/4 π
1 - 3/4 π + C = 2 - 3/4 π
C = 1
sehingga,
F(x) = tan(x) - 3x + 1