Title: MAT. Equacions trigonomètriques
Course: Matemàtiques de 3r d'ESO

Q: Resol l'equació $${{a}}\cos^2 x+\sin^2 x = {{b}}$$
- {=acos(sqrt(({b}-1)/({a}-1)))*180/pi()}+180k, k en Z
- {=-acos(sqrt(({b}-1)/({a}-1)))*180/pi()}+180k, k en Z
- {=acos(0.8*sqrt({b}-1)/({a}-1))*180/pi()}+360k, k en Z
- {=-acos(0.8*sqrt({b}-1)/({a}-1))*180/pi()}+360k, k en Z
- {=acos(0.2*sqrt({b}-1)/({a}-1))*180/pi()}+360k, k en Z
- {=acos(-0.2*sqrt({b}-1)/({a}-1))*180/pi()}+360k, k en Z
- {=acos(0.2*sqrt({b}-1)/({a}-1))*180/pi()}+180k, k en Z
- {=-acos(0.2*sqrt({b}-1)/({a}-1))*180/pi()}+180k, k en Z
- No té solució
- {=acos(({b}-1)/({a}-1))*180/pi()}+180k, k en Z
- {=-acos(({b}-1)/({a}-1))*180/pi()}+180k, k en Z
- {=acos(({b}-1)/({a}-1))*180/pi()}+360k, k en Z
- {=-acos(({b}-1)/({a}-1))*180/pi()}+360k, k en Z
A: {=acos(sqrt(({b}-1)/({a}-1)))*180/pi()}+180k, k en Z (formula; values not in the backup's text) / {=-acos(sqrt(({b}-1)/({a}-1)))*180/pi()}+180k, k en Z (formula; values not in the backup's text)
If right: La teva resposta és correcta.
If partly right: La teva resposta és parcialment correcta.
If wrong: La teva resposta és incorrecta.