Question 1

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Sabent que cos open parentheses alpha close parentheses equals fraction numerator negative 4 over denominator 5 end fraction i alpha element of open square brackets pi over 2 comma pi close square brackets. Calculeu: sin open parentheses alpha close parentheses equals 3 over d on d= T a n open parentheses alpha close parentheses equals n over 4 on n=

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