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=> y' = 10 * (sin5x)⁹ * 5cos5x
=> y' = 50 (sin5x)⁹ * cos5x
b.) y = 3x⁵(cos8x)⁸
Misalkan u(x) = 3x⁵ dan v(x) = (cos8x)⁸.
=> y' = u'(x)v(x) + u(x)v'(x)
=> y' = 15x²(cos8x)⁸ + 3x⁵ * 8 (cos8x)⁷ -8sin8x
=> y' = 15x²(cos8x)⁸ - 192x⁵sin8x(cos8x)⁷
=> y' = 3x²(cos8x)⁷(5cos8x - 64x³sin8x)
a.)
b.)