y = cos³(4.tan(2x) )
y = (cos(4.tan(2x) ) )³
subtitusi 2x = u , 4.tan(u) = v , cos(v) = w
y = w³
dy = d(w³)
= 3w².d(w) <= w = cos(v)
= 3.cos²(v) . d(cos(v) )
= -3.cos²(v).sin(v).d(v) <= v = 4.tan(u)
= -3.cos²(4.tan(u)) . sin(4.tan(u)) . d(4.tan(u))
= -3.4.cos²(4.tan(u)) . sec²(u) . sin(4.tan(u)) . d(u) <= u = 2x
dy/dx = -24.cos²(4.tan(2x)) . sec²(2x) . sin(4.tan(2x))
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y = cos³(4.tan(2x) )
y = (cos(4.tan(2x) ) )³
subtitusi 2x = u , 4.tan(u) = v , cos(v) = w
y = w³
dy = d(w³)
= 3w².d(w) <= w = cos(v)
= 3.cos²(v) . d(cos(v) )
= -3.cos²(v).sin(v).d(v) <= v = 4.tan(u)
= -3.cos²(4.tan(u)) . sin(4.tan(u)) . d(4.tan(u))
= -3.4.cos²(4.tan(u)) . sec²(u) . sin(4.tan(u)) . d(u) <= u = 2x
dy/dx = -24.cos²(4.tan(2x)) . sec²(2x) . sin(4.tan(2x))