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y' = -2 sin 2x
-2 sin 2x = 0
sin 2x = 0
2x = arcsin 0
2x = 0 , pi, 2*pi , 3*pi, 4*pi
x = {0 , pi/2 , pi, (3pi)/2 , 2pi}
***Fungsi naik bila
y' > 0***
- Tes segmen I: (antara 0 - pi/2) --> pi/4
- 2 sin (2 * pi/4) = - 2 sin (pi/2) = -2(1) = -2 --> (-) SI fungsi turun
- Tes segmen II : (antara pi/2 - (pi)) --> (3pi/4)
- 2 sin (2 * (3pi/4)) = -2 sin (3pi/2) = -2(-1) = 2 --> (+) SII fungsi naik
- Tes segmen III: (antara (pi - 3pi/2) --> (5pi)/4
- 2 sin (2*(5pi)/4) = - 2 sin (5pi/2) = -2(1) = -2 --> (-) SI fungsi turun
- Tes segmen IV : (antara 3pi/2 - (2pi)) --> (7pi/4)
- 2 sin (2 * (7pi/4)) = -2 sin (7pi/2) = -2(-1) = 2 --> (+) SII fungsi naik