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Beliebt Trigonometrie >

sin^2(x)+2cos^2(x)=1

Lösung

sin^{2} (x) + 2 cos^{2} (x) = 1

Lösung

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

+1

Grad

x = 9 0^{\circ} + 36 0^{\circ} n, x = 27 0^{\circ} + 36 0^{\circ} n

Schritte zur Lösung

sin^{2} (x) + 2 cos^{2} (x) = 1

Subtrahiere

1

von beiden Seiten

sin^{2} (x) + 2 cos^{2} (x) - 1 = 0

Umschreiben mit Hilfe von Trigonometrie-Identitäten

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

Verwende die Pythagoreische Identität:

1 = cos^{2} (x) + sin^{2} (x)

1 - sin^{2} (x) = cos^{2} (x)

= 2 cos^{2} (x) - cos^{2} (x)

Vereinfache

= cos^{2} (x)

cos^{2} (x) = 0

Wende Regel an

x^{n} = 0 \Rightarrow x = 0

cos (x) = 0

Allgemeine Lösung für

cos (x) = 0

cos (x)

Periodizitätstabelle mit

2 πn

Zyklus:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

Graph

Beliebte Beispiele

(sin^2(a)+1)/(tan^2(a))=1

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cos^2(x)+5cos(x)-2=0

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