Question

Помогите решить 5 номер

Answer 1

$2 \cos(2\pi + \beta ) + 5 \sin( - \frac{\pi}{2} + \beta ) \\ 2 \cos( \beta ) - 5 \sin( \frac{\pi}{2} - \beta ) = 2 \cos( \beta ) - 5 \cos( \beta ) \\ \cos( \beta ) = - \frac{2}{3} \\ 2 \times ( - \frac{2}{3} ) - 5 \times ( - \frac{2}{3} ) = - \frac{4}{3} + \frac{10}{3} = \frac{6}{3} = \frac{1}{2} = 0.5$

Answer 2

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