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Beliebt Trigonometrie >

cos^2(x)= 9/16

Lösung

cos^{2} (x) = \frac{9}{16}

Lösung

x = 0.72273 \dots + 2 πn, x = 2 π - 0.72273 \dots + 2 πn, x = 2.41885 \dots + 2 πn, x = - 2.41885 \dots + 2 πn

+1

Grad

x = 41.40962 \dots^{\circ} + 36 0^{\circ} n, x = 318.59037 \dots^{\circ} + 36 0^{\circ} n, x = 138.59037 \dots^{\circ} + 36 0^{\circ} n, x = - 138.59037 \dots^{\circ} + 36 0^{\circ} n

Schritte zur Lösung

cos^{2} (x) = \frac{9}{16}

Löse mit Substitution

cos^{2} (x) = \frac{9}{16}

Angenommen:

cos (x) = u

u^{2} = \frac{9}{16}

u^{2} = \frac{9}{16} : u = \frac{3}{4}, u = - \frac{3}{4}

u^{2} = \frac{9}{16}

Für

x^{2} = f (a)

sind die Lösungen

x = f (a), - f (a)

u = \frac{9}{16}, u = - \frac{9}{16}

\frac{9}{16} = \frac{3}{4}

\frac{9}{16}

Wende Radikal Regel an:

n \frac{a}{b} = \frac{n a}{n b},

angenommen

a \geq 0, b \geq 0

= \frac{9}{16}

16 = 4

16

Faktorisiere die Zahl:

16 = 4^{2}

= 4^{2}

Wende Radikal Regel an:

n a^{n} = a

4^{2} = 4

= 4

= \frac{9}{4}

9 = 3

9

Faktorisiere die Zahl:

9 = 3^{2}

= 3^{2}

Wende Radikal Regel an:

n a^{n} = a

3^{2} = 3

= 3

= \frac{3}{4}

- \frac{9}{16} = - \frac{3}{4}

- \frac{9}{16}

Vereinfache

\frac{9}{16} : \frac{3}{4}

\frac{9}{16}

Wende Radikal Regel an:

n \frac{a}{b} = \frac{n a}{n b},

angenommen

a \geq 0, b \geq 0

= \frac{9}{16}

16 = 4

16

Faktorisiere die Zahl:

16 = 4^{2}

= 4^{2}

Wende Radikal Regel an:

n a^{n} = a

4^{2} = 4

= 4

= \frac{9}{4}

9 = 3

9

Faktorisiere die Zahl:

9 = 3^{2}

= 3^{2}

Wende Radikal Regel an:

n a^{n} = a

3^{2} = 3

= 3

= \frac{3}{4}

= - \frac{3}{4}

u = \frac{3}{4}, u = - \frac{3}{4}

Setze in

u = cos (x)

ein

cos (x) = \frac{3}{4}, cos (x) = - \frac{3}{4}

cos (x) = \frac{3}{4}, cos (x) = - \frac{3}{4}

cos (x) = \frac{3}{4} : x = arccos (\frac{3}{4}) + 2 πn, x = 2 π - arccos (\frac{3}{4}) + 2 πn

cos (x) = \frac{3}{4}

Wende die Eigenschaften der Trigonometrie an

cos (x) = \frac{3}{4}

Allgemeine Lösung für

cos (x) = \frac{3}{4}

cos (x) = a \Rightarrow x = arccos (a) + 2 πn, x = 2 π - arccos (a) + 2 πn

x = arccos (\frac{3}{4}) + 2 πn, x = 2 π - arccos (\frac{3}{4}) + 2 πn

x = arccos (\frac{3}{4}) + 2 πn, x = 2 π - arccos (\frac{3}{4}) + 2 πn

cos (x) = - \frac{3}{4} : x = arccos (- \frac{3}{4}) + 2 πn, x = - arccos (- \frac{3}{4}) + 2 πn

cos (x) = - \frac{3}{4}

Wende die Eigenschaften der Trigonometrie an

cos (x) = - \frac{3}{4}

Allgemeine Lösung für

cos (x) = - \frac{3}{4}

cos (x) = - a \Rightarrow x = arccos (- a) + 2 πn, x = - arccos (- a) + 2 πn

x = arccos (- \frac{3}{4}) + 2 πn, x = - arccos (- \frac{3}{4}) + 2 πn

x = arccos (- \frac{3}{4}) + 2 πn, x = - arccos (- \frac{3}{4}) + 2 πn

Kombiniere alle Lösungen

x = arccos (\frac{3}{4}) + 2 πn, x = 2 π - arccos (\frac{3}{4}) + 2 πn, x = arccos (- \frac{3}{4}) + 2 πn, x = - arccos (- \frac{3}{4}) + 2 πn

Zeige Lösungen in Dezimalform

x = 0.72273 \dots + 2 πn, x = 2 π - 0.72273 \dots + 2 πn, x = 2.41885 \dots + 2 πn, x = - 2.41885 \dots + 2 πn

Graph

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