Question

помогите решить ,арккатангенс​

Answer 1

1) $sin (arcsin(\frac{5}{8})) = \frac{5}{8}$

2) $cos(arcsin(\frac{5}{13})) = \sqrt{1 - (\frac{5}{13}) ^{2} } =\sqrt{\frac{169-25}{169} } = \sqrt{\frac{144}{169} } = \frac{12}{13}$