Trigonometria Exemplos

${(3 \cos (115) + i \sin (115))}^{4}$

Etapa 1

Use o teorema binomial.

${(3 \cos (115))}^{4} + 4 {(3 \cos (115))}^{3} (i \sin (115)) + 6 {(3 \cos (115))}^{2} {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2

Simplifique os termos.

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Etapa 2.1

Simplifique cada termo.

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Etapa 2.1.1

Aplique a regra do produto a $3 \cos (115)$ .

$3^{4} \cos^{4} (115) + 4 {(3 \cos (115))}^{3} (i \sin (115)) + 6 {(3 \cos (115))}^{2} {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.2

Eleve $3$ à potência de $4$ .

$81 \cos^{4} (115) + 4 {(3 \cos (115))}^{3} (i \sin (115)) + 6 {(3 \cos (115))}^{2} {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.3

Aplique a regra do produto a $3 \cos (115)$ .

$81 \cos^{4} (115) + 4 (3^{3} \cos^{3} (115)) (i \sin (115)) + 6 {(3 \cos (115))}^{2} {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.4

Eleve $3$ à potência de $3$ .

$81 \cos^{4} (115) + 4 (27 \cos^{3} (115)) (i \sin (115)) + 6 {(3 \cos (115))}^{2} {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.5

Multiplique $27$ por $4$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) (i \sin (115)) + 6 {(3 \cos (115))}^{2} {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.6

Aplique a regra do produto a $3 \cos (115)$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) + 6 (3^{2} \cos^{2} (115)) {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.7

Eleve $3$ à potência de $2$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) + 6 (9 \cos^{2} (115)) {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.8

Multiplique $9$ por $6$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) + 54 \cos^{2} (115) {(i \sin (115))}^{2} + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.9

Aplique a regra do produto a $i \sin (115)$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) + 54 \cos^{2} (115) (i^{2} \sin^{2} (115)) + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.10

Reescreva $i^{2}$ como $- 1$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) + 54 \cos^{2} (115) (- 1 \sin^{2} (115)) + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.11

Reescreva $- 1 \sin^{2} (115)$ como $- \sin^{2} (115)$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) + 54 \cos^{2} (115) (- \sin^{2} (115)) + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.12

Multiplique $- 1$ por $54$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) + 4 (3 \cos (115)) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.13

Multiplique $3$ por $4$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) + 12 \cos (115) {(i \sin (115))}^{3} + {(i \sin (115))}^{4}$

Etapa 2.1.14

Aplique a regra do produto a $i \sin (115)$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) + 12 \cos (115) (i^{3} \sin^{3} (115)) + {(i \sin (115))}^{4}$

Etapa 2.1.15

Fatore $i^{2}$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) + 12 \cos (115) (i^{2} \cdot i \sin^{3} (115)) + {(i \sin (115))}^{4}$

Etapa 2.1.16

Reescreva $i^{2}$ como $- 1$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) + 12 \cos (115) (- 1 \cdot i \sin^{3} (115)) + {(i \sin (115))}^{4}$

Etapa 2.1.17

Reescreva $- 1 i$ como $- i$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) + 12 \cos (115) (- i \sin^{3} (115)) + {(i \sin (115))}^{4}$

Etapa 2.1.18

Multiplique $- 1$ por $12$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) (i \sin^{3} (115)) + {(i \sin (115))}^{4}$

Etapa 2.1.19

Aplique a regra do produto a $i \sin (115)$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) i \sin^{3} (115) + i^{4} \sin^{4} (115)$

Etapa 2.1.20

Reescreva $i^{4}$ como $1$ .

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Etapa 2.1.20.1

Reescreva $i^{4}$ como ${(i^{2})}^{2}$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) i \sin^{3} (115) + {(i^{2})}^{2} \sin^{4} (115)$

Etapa 2.1.20.2

Reescreva $i^{2}$ como $- 1$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) i \sin^{3} (115) + {(- 1)}^{2} \sin^{4} (115)$

Etapa 2.1.20.3

Eleve $- 1$ à potência de $2$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) i \sin^{3} (115) + 1 \sin^{4} (115)$

Etapa 2.1.21

Multiplique $\sin^{4} (115)$ por $1$ .

$81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) i \sin^{3} (115) + \sin^{4} (115)$

Etapa 2.2

Simplifique a expressão.

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Etapa 2.2.1

Reordene os fatores em $81 \cos^{4} (115) + 108 \cos^{3} (115) i \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 \cos (115) i \sin^{3} (115) + \sin^{4} (115)$ .

$81 \cos^{4} (115) + 108 i \cos^{3} (115) \sin (115) - 54 \cos^{2} (115) \sin^{2} (115) - 12 i \cos (115) \sin^{3} (115) + \sin^{4} (115)$

Etapa 2.2.2

Reordene $81 \cos^{4} (115) + 108 i \cos^{3} (115) \sin (115)$ e $- 54 \cos^{2} (115) \sin^{2} (115)$ .

$- 54 \cos^{2} (115) \sin^{2} (115) + 81 \cos^{4} (115) + 108 i \cos^{3} (115) \sin (115) - 12 i \cos (115) \sin^{3} (115) + \sin^{4} (115)$

Etapa 2.2.3

Reordene $- 54 \cos^{2} (115) \sin^{2} (115) + 81 \cos^{4} (115) + 108 i \cos^{3} (115) \sin (115) - 12 i \cos (115) \sin^{3} (115)$ e $\sin^{4} (115)$ .

$\sin^{4} (115) - 54 \cos^{2} (115) \sin^{2} (115) + 81 \cos^{4} (115) + 108 i \cos^{3} (115) \sin (115) - 12 i \cos (115) \sin^{3} (115)$