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y=cos5x
y'=-5sin5x
b.
y=sin^4(2x)
y'=4sin^3(2x).cos(2x).2
y'=8sin^3(2x)cos(2x)
y' = - 5 sin 5x
b) y = sin⁴ 2x
y' = 4 sin³ 2x . 2 cos 2x
= 8 sin³ 2x . cos 2x
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