Найдмте значения выражения 5cos29/sin61

Лебедев Дмитрий Сергеевич

Учитель математики

Проверено учителем

Для решения выражения 5cos29sin61the fraction with numerator 5 cosine 29 raised to the composed with power and denominator sine 61 raised to the composed with power end-fraction воспользуемся формулами приведения тригонометрических функций. Шаг 1: Анализ углов Заметим, что сумма углов в числителе и знаменателе равна 9090 raised to the composed with power: 29+61=9029 raised to the composed with power plus 61 raised to the composed with power equals 90 raised to the composed with powerШаг 2: Применение формулы приведения Используем свойство дополнительных углов, которое гласит: cosα=sin(90α)cosine alpha equals sine open paren 90 raised to the composed with power minus alpha close parenПрименим это для косинуса в числителе: cos29=sin(9029)=sin61cosine 29 raised to the composed with power equals sine open paren 90 raised to the composed with power minus 29 raised to the composed with power close paren equals sine 61 raised to the composed with powerШаг 3: Подстановка и упрощение Заменим cos29cosine 29 raised to the composed with power в исходном выражении на полученное значение sin61sine 61 raised to the composed with power: 5cos29sin61=5sin61sin61the fraction with numerator 5 cosine 29 raised to the composed with power and denominator sine 61 raised to the composed with power end-fraction equals the fraction with numerator 5 sine 61 raised to the composed with power and denominator sine 61 raised to the composed with power end-fraction Так как sin610sine 61 raised to the composed with power is not equal to 0, мы можем сократить дробь на это значение: 5sin61sin61=5the fraction with numerator 5 center dot modified sine 61 raised to the composed with power with cross out and denominator modified sine 61 raised to the composed with power with cross out end-fraction equals 5 Ответ: 5 Хотите, чтобы я помог решить еще одну тригонометрическую задачу или разобрал аналогичный пример с тангенсами?

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