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Sifat :
1/sec(3x) = cos(3x)
Menjadi:
f(x) = sin(5x) + cos(3x)
Dengan sifat trigonometri:
g(x) = sin(ax), maka g'(x) = a.cos(ax)
h(x) = cos(bx), maka h'(x) = -b.sin(bx)
Menjadikan:
f'(x) = 5.sin(5x) + (-3.sin(3x))
f'(x) = 5sin(5x) - 3sin(3x)
= sin 5x + cos 3x
f ' (x) = 5 cos 5x - 3 sin 3x