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= a ln = a ln ( )<br />

= a ln ( sinu)<br />

sin u<br />

sinu<br />

sin u<br />

= a ln ( sinu)<br />

cos u<br />

sinu<br />

cos u<br />

= a ln x x a<br />

x x a (terbukti)<br />

x a dx = x x a<br />

a<br />

ln x x a ( . )<br />

Bukti<br />

x<br />

x<br />

a<br />

u<br />

a<br />

Dari gambar diatas didapat<br />

secu = x x<br />

u = sec<br />

a<br />

a<br />

a secu = x a secu tanu du = dx<br />

adi x a dx = (a tanu)(a secu tanu du) = a tan u secu du<br />

= a (sec u ) secu du = a (sec u secu) du<br />

= x x a<br />

a<br />

ln x x a (terbukti)<br />

7.8.2 Integrasi fungsi yang mempunyai bentuk 1/(x 2 +a 2 )<br />

dx<br />

x a = a tan x<br />

a<br />

( . )<br />

Bukti<br />

x a x<br />

Dari gambar diatas didapat,<br />

u<br />

a<br />

159

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