https://www.theodysseyonline.com/full-watch-bloodshot-2020-full-movie-at-online-free-2645831296
https://www.theodysseyonline.com/full-watch-birds-of-prey-2020-full-movie-at-online-free-2645831295
https://www.theodysseyonline.com/full-watch-like-a-boss-2020-full-movie-at-online-free-2645831294
https://www.theodysseyonline.com/full-watch-escape-from-pretoria-2020-full-movie-at-online-free-2645831293
https://www.theodysseyonline.com/full-watch-underwater-2020-full-movie-at-online-free-2645831236
Объяснение:
не указан угол, синус которого равен 0,9.
скорее всего sin a = 0.9.
1) по основной тригонометрической формуле: cos a =(1-sin^2 a) = √(1-0.81) = √0,19.
2) по определению косинуса: cos a = ac/ab;
ab=ac/cos a = √19 / √0,19 = √(19/0,19) =√100=10.