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...... 1. Escriba cada expresion trinometrica en terminos de seno y coseno y simplifique: A. see(-2) sec I - COS I b. tan I c.

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1. Escriba cada expresion trinometrica en terminos de seno y coseno y simplifique: A. see(-2) sec I - COS I b. tan I c. tan I COS I CSC I 2. Verifique cada identidad: a. csc x cscr + sen(-r)] = cof x b. 1 - tan a tan y = cos(cty) COS I COS y c. sen' r - cos r = sen' r - cos' r 3. Usando la identidad de la suma o la resta, hallar el valor exacto de: a. tan(75) b. sen (195" ) C. COS (15)

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