pakai turunan :
y' = 2 cos x + cos x <= y' = 0
0 = 3 cos x
cos x = 0
x = π/2 atau 3π/2
untuk x = π/2
y = sin²(π/2) + sin(π/2)
y = 1²+1
y = 2
untuk x = 3π/2
y = sin²(3π/2) + sin(3π/2)
= (-1)² + (-1)
= 1 - 1
y = 0
nilai minimum = 0
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pakai turunan :
y' = 2 cos x + cos x <= y' = 0
0 = 3 cos x
cos x = 0
x = π/2 atau 3π/2
untuk x = π/2
y = sin²(π/2) + sin(π/2)
y = 1²+1
y = 2
untuk x = 3π/2
y = sin²(3π/2) + sin(3π/2)
= (-1)² + (-1)
= 1 - 1
y = 0
nilai minimum = 0