Posted by andi telaumbanua on Jul 28, 2018 in
Matematika
Tentukan turunan pertama dari tan (xy) – 2y = 0
Jawab:
d/dx(tan(xy)-d/dx(2y)=d/dx(0)
Pertama Turunkan: d/dx(tan(xy)
d/dx(tan(xy)=[(1)(y)+ (x)(dy/dx)][sec^2(xy)]
=(y+x dy/dx)(sec^2 (xy)
=y sec^2(xy) + x dy/dx sec^2(xy)
Maka:
d/dx(tan(xy)-d/dx(2y)= d/dx()
y sec^2(xy) + x dy/dx sec^2(xy) -2 dy/dx = 0
x dy/dx sec^2(xy)-2 dy/dx = -y sec^2xy
dy/dx(x sec^2(xy)-2) = -y sec^2(xy)
dy/dx = -y sec^2(xy))/(x sec^2(xy)-2)
Posted by andi telaumbanua on Jul 28, 2018 in
Matematika
Turunan pertama dari f(x) = (1 + 1/x^2 )(1+1/x^3 )
Jawab:
f(x) = U*V
f^’ (x)= U^’ V* UV^’
Maka:
f(x) = (1 + 1/x^2 )(1+1/x^3 )
f^’ (x)=((0-2x)/x^4 )((0-3x)/x^6 )
f^’ (x)=(2x/x^4 )(3x/x^6 )
f^’ (x)=((6x^2)/x^10 )
f^’ (x)=(6/x^8 )
Posted by andi telaumbanua on Jul 28, 2018 in
Matematika
carilah anti turunan F(x) + C bila
a. f(x) = (x^2-x)/(2x^3- 3x^2+ 1)
b. f(x) = x^(-3/4)
Jawab:
∫f (x)dx=F(x)+ C
Maka:
a. f(x) = (x^2-x)/(2x^3- 3x^2+ 1) anti turunannya adalah
∫ ((x^2-x)/(2x^3- 3x^2+ 1))dx
Mis : a = 2x^3- 3x^2+ 1
Maka: dx = da/(6x^2-6x)
Sehingga:
∫ ((x^2-x)/(2x^3- 3x^2+ 1))dx= ∫ ((x^2-x)/a) da/(6x^2-6x)
=1/6 ∫(da/a)
=1/6 ( ln a)+C
=1/6 ln( 2x^3 – 3x^2+ 1)+C
b. f(x) = x^(-3/4) anti turunannya adalah
∫x^(-3/4) dx=1/0,25 x^0,25+ C
Posted by andi telaumbanua on Jul 28, 2018 in
Matematika
carilah anti turunan F(x) + C bila
a. f(x) = 3x^2-10x+5
b. f(x) = x^2 (20x^7- 7x^5+6)
c. f(x) = 1/x^3 +6/x^7
Jawab:
∫f(x)dx = F(x)+ C
Maka:
a. f(x) = 3x^2-10x+5 anti turunannya adalah
∫ (3x^2-10x+5)dx = 3/3 x^3-10/2 x^2+5x+ C
= x^3-5x^2+5x+C
b. f(x) = x^2 (20x^7- 7x^5+6) anti turunannya adalah
∫ x^2 (20x^7- 7x^5+6) dx = ∫ (20x^9- 7x^7+6x^2 ) dx
= 20/10 x^10-7/8 x^8+6/3 x^3+ C
= 2 x^10-7/8 x^8+ 2x^3+ C
c. f(x) = 1/x^3 +6/x^7 anti turunannya adalah
∫ (1/x^3 +6/x^7 )dx = -1/2 x^(-2)-6/6 x^(-6)
=-1/(2x^2 )-1/x^6
Posted by andi telaumbanua on Jul 28, 2018 in
Matematika
Tentukanlah integral dari
Jawab:
sehingga:
= [{-1/2 (4) + 2(2)} – {-1/2 (1) + 2(1)}] + [{1/2 (25) – 2(5)} – {1/2 (4) – 2(2)}]
= – 2 + 4 + 0,5 – 2 + 12,5 – 10 – 2 + 4
= 5