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Beliebt Trigonometrie >

10cos^2(x)=5

Lösung

10 cos^{2} (x) = 5

Lösung

x = 0.78539 \dots + 2 πn, x = 2 π - 0.78539 \dots + 2 πn, x = 2.35619 \dots + 2 πn, x = - 2.35619 \dots + 2 πn

+1

Grad

x = 4 5^{\circ} + 36 0^{\circ} n, x = 31 5^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n, x = - 13 5^{\circ} + 36 0^{\circ} n

Schritte zur Lösung

10 cos^{2} (x) = 5

Löse mit Substitution

10 cos^{2} (x) = 5

Angenommen:

cos (x) = u

10 u^{2} = 5

10 u^{2} = 5 : u = \frac{1}{2}, u = - \frac{1}{2}

10 u^{2} = 5

Teile beide Seiten durch

10

10 u^{2} = 5

Teile beide Seiten durch

10

\frac{10 u ^{2}}{10} = \frac{5}{10}

Vereinfache

u^{2} = \frac{1}{2}

u^{2} = \frac{1}{2}

Für

x^{2} = f (a)

sind die Lösungen

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

u = \frac{1}{2}, u = - \frac{1}{2}

Setze in

u = cos (x)

ein

cos (x) = \frac{1}{2}, cos (x) = - \frac{1}{2}

cos (x) = \frac{1}{2}, cos (x) = - \frac{1}{2}

cos (x) = \frac{1}{2} : x = arccos (\frac{1}{2}) + 2 πn, x = 2 π - arccos (\frac{1}{2}) + 2 πn

cos (x) = \frac{1}{2}

Wende die Eigenschaften der Trigonometrie an

cos (x) = \frac{1}{2}

Allgemeine Lösung für

cos (x) = \frac{1}{2}

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

x = arccos (\frac{1}{2}) + 2 πn, x = 2 π - arccos (\frac{1}{2}) + 2 πn

x = arccos (\frac{1}{2}) + 2 πn, x = 2 π - arccos (\frac{1}{2}) + 2 πn

cos (x) = - \frac{1}{2} : x = arccos (- \frac{1}{2}) + 2 πn, x = - arccos (- \frac{1}{2}) + 2 πn

cos (x) = - \frac{1}{2}

Wende die Eigenschaften der Trigonometrie an

cos (x) = - \frac{1}{2}

Allgemeine Lösung für

cos (x) = - \frac{1}{2}

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

x = arccos (- \frac{1}{2}) + 2 πn, x = - arccos (- \frac{1}{2}) + 2 πn

x = arccos (- \frac{1}{2}) + 2 πn, x = - arccos (- \frac{1}{2}) + 2 πn

Kombiniere alle Lösungen

x = arccos (\frac{1}{2}) + 2 πn, x = 2 π - arccos (\frac{1}{2}) + 2 πn, x = arccos (- \frac{1}{2}) + 2 πn, x = - arccos (- \frac{1}{2}) + 2 πn

Zeige Lösungen in Dezimalform

x = 0.78539 \dots + 2 πn, x = 2 π - 0.78539 \dots + 2 πn, x = 2.35619 \dots + 2 πn, x = - 2.35619 \dots + 2 πn

Graph

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