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turunan Dari y=sin^2 5x adalah y'=(2a -1)sin5bx , maka a.b adalah...
y' = 2sin5x .cos5x . 5
y' = sin2(5x) . 5
y' = 5sin10x = (2a -1)sin5bx ,
2a-1 = 5
2a=6
a= 3
5b = 10
b = 2
maka , a.b = 3.2 = 6