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4. Pruebe la identidad: a. sen(8r) = 2sen Ar cos 4.r b. Manz = sen 21 1 + ton- I c. cot 21 = 1-tandr

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4. Pruebe la identidad: a. sen(8r) = 2sen Ar cos 4.r b. Manz = sen 21 1 + ton- I c. cot 21 = 1-tandr 2tan 5. En cada caso hallar sen(;), cos(;) y tan(;) dada la siguiente informacion: a. cos r = -, I en el cuadrante III b. tan x = 1, r en el cuadrante / 6. Encuentro las soluciones de cada ecuacion trigonometrica: a. (tan B - 2) (16sen2 8 - 1) = 0 b. sen2 8 - 2sen 8 - 3 =0 c. 3tan B = tan B 7. Para los angulos a y B en la figura, hallar cos(a - B) 12 2 Figura 1

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