English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

integral of cos(x)(1-sin(x))

Soluzione

\int cos (x) (1 - sin (x)) d x

- 2 cos^{2} (\frac{x}{2}) (- tan (\frac{x}{2}) + sin^{2} (\frac{x}{2})) + C

Fasi della soluzione

\int cos (x) (1 - sin (x)) d x

Moltiplicare per il coniugato di

1 - sin (x) : \frac{cos ^{2} ( x )}{1 + sin ( x )}

= \int cos (x) \frac{cos ^{2} ( x )}{1 + sin ( x )} d x

Semplifica

cos (x) \frac{cos ^{2} ( x )}{1 + sin ( x )} : \frac{cos ^{3} ( x )}{1 + sin ( x )}

= \int \frac{cos ^{3} ( x )}{1 + sin ( x )} d x

Applicare la sostituzione u

= \int - \frac{2 ( u + 1 ) ( u - 1 ) ^{3}}{( u ^{2} + 1 ) ^{3}} d u

Porta fuori la costante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - 2 \cdot \int \frac{( u + 1 ) ( u - 1 ) ^{3}}{( u ^{2} + 1 ) ^{3}} d u

Prendi la frazione parziale di

\frac{( u + 1 ) ( u - 1 ) ^{3}}{( u ^{2} + 1 ) ^{3}} : \frac{1}{u ^{2} + 1} + \frac{- 2 u - 2}{( u ^{2} + 1 ) ^{2}} + \frac{4 u}{( u ^{2} + 1 ) ^{3}}

= - 2 \cdot \int \frac{1}{u ^{2} + 1} + \frac{- 2 u - 2}{( u ^{2} + 1 ) ^{2}} + \frac{4 u}{( u ^{2} + 1 ) ^{3}} d u

Applica la Regola della Somma:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= - 2 (\int \frac{1}{u ^{2} + 1} d u + \int \frac{- 2 u - 2}{( u ^{2} + 1 ) ^{2}} d u + \int \frac{4 u}{( u ^{2} + 1 ) ^{3}} d u)

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

\int \frac{- 2 u - 2}{( u ^{2} + 1 ) ^{2}} d u = \frac{1}{u ^{2} + 1} - arctan (u) - \frac{u}{1 + u ^{2}}

\int \frac{4 u}{( u ^{2} + 1 ) ^{3}} d u = - \frac{1}{( u ^{2} + 1 ) ^{2}}

= - 2 (arctan (u) + \frac{1}{u ^{2} + 1} - arctan (u) - \frac{u}{1 + u ^{2}} - \frac{1}{( u ^{2} + 1 ) ^{2}})

Sostituire indietro

u = tan (\frac{x}{2})

= - 2 (arctan (tan (\frac{x}{2})) + \frac{1}{tan ^{2} ( \frac{x}{2} ) + 1} - arctan (tan (\frac{x}{2})) - \frac{tan ( \frac{x}{2} )}{1 + tan ^{2} ( \frac{x}{2} )} - \frac{1}{( tan ^{2} ( \frac{x}{2} ) + 1 ) ^{2}})

Semplificare

- 2 (arctan (tan (\frac{x}{2})) + \frac{1}{tan ^{2} ( \frac{x}{2} ) + 1} - arctan (tan (\frac{x}{2})) - \frac{tan ( \frac{x}{2} )}{1 + tan ^{2} ( \frac{x}{2} )} - \frac{1}{( tan ^{2} ( \frac{x}{2} ) + 1 ) ^{2}}) : - 2 cos^{2} (\frac{x}{2}) (- tan (\frac{x}{2}) + sin^{2} (\frac{x}{2}))

= - 2 cos^{2} (\frac{x}{2}) (- tan (\frac{x}{2}) + sin^{2} (\frac{x}{2}))

Aggiungi una costante alla soluzione

= - 2 cos^{2} (\frac{x}{2}) (- tan (\frac{x}{2}) + sin^{2} (\frac{x}{2})) + C

\int x^{2} (2 x^{3} + 1) d x

\int sin (2 x) e^{s i n^{2} (x)} d x

\int \frac{x + 1}{3 3 x + 1} d x

\int sin (x) ln (tan (x)) d x

\int \frac{cot ( x )}{1 + sin ( x )} d x