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Fungsi dan Grafik Fungsi dan Grafik Diferensial dan ... - Ee-cafe.org

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13.8. Integral <strong>Fungsi</strong> Trigonometri<br />

∫<br />

∫<br />

Karena d sin v = cosvdv<br />

maka cos v dx = sin v + K<br />

Karena d cosv<br />

= −sin<br />

vdx maka sin v dx = −cosv<br />

+ K<br />

Relasi diferensial <strong>dan</strong> integral fungsi trigonometri yang lain<br />

termuat dalam Tabel-13.1.<br />

Contoh: Carilah integral tak tentu<br />

164 Sudaryatno Sudirham, <strong>Fungsi</strong> <strong>dan</strong> <strong>Grafik</strong>, <strong>Diferensial</strong> <strong>dan</strong> Integral<br />

∫<br />

y = sin 2xdx<br />

dv<br />

dv<br />

Misalkan v = 2x<br />

→ = 2 → dx =<br />

dx<br />

2<br />

sin v −cosv<br />

cos 2x<br />

y =<br />

∫<br />

sin 2xdx<br />

=<br />

∫<br />

dv = = −<br />

2 2 2<br />

Soal-Soal : Carilah integral tak tentu berikut ini.<br />

∫<br />

sin 4xdx ;<br />

∫<br />

cos(2x<br />

+ 2) dx ;<br />

∫<br />

4cos3xdx<br />

.<br />

∫<br />

∫<br />

∫<br />

2sin x cos xdx ;<br />

2<br />

sin xdx ;<br />

∫<br />

∫<br />

2<br />

cos axdx<br />

2<br />

sin x cos xdx .<br />

sin 2x<br />

cos 2 xsin<br />

xdx ;<br />

∫<br />

dx .<br />

2 − cos 2x<br />

13.9. Integral <strong>Fungsi</strong> Hiperbolik<br />

∫<br />

∫<br />

Karena d(sinh v)<br />

= cosh v maka cosh vdv = sinh v + K<br />

Karena d(cosh v)<br />

= sinh vdv maka sinh vdv = cosh v + K<br />

Relasi diferensial <strong>dan</strong> integral fungsi hiperbolik yang lain termuat<br />

dalam Tabel-13.1.<br />

Contoh: Carilah y =<br />

∫<br />

cosh( 2x<br />

+ 1)<br />

dx<br />

dv<br />

dv<br />

Misalkan v = 2x<br />

+ 1→<br />

= 2 → dx =<br />

dx<br />

2<br />

1<br />

y =<br />

∫<br />

cosh(2x<br />

+ 1) dx =<br />

∫<br />

cosh( v)<br />

dv =<br />

2<br />

1<br />

= sinh(2x<br />

+ 1) + K<br />

2<br />

1<br />

sinh<br />

2<br />

v + K

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