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Secci6n 7.4 Identidades producto-suma y suma-producto 7. Utiliza la frmula del producto-suma para hallar el valor de sin 20 sin 90. 8. Utiliza la
Secci6n 7.4 Identidades producto-suma y suma-producto 7. Utiliza la frmula del producto-suma para hallar el valor de sin 20 sin 90. 8. Utiliza la formula de suma-producto para hallar el valor de cos 59 - cos 36. Secci6n 7.5 Ecuaciones trigonomtricas 9. Halla la soluci6n de: (a) 2 sin x + -o Secci6n 6.6 Funciones trigonomtricas inversas. 10. Halla el valor exacto de: (a) cos-l (cos Tt/4) (b) cosx=-0 34 (b) tan (sin-1 2/3)
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