Question

1. Известно, что tga=-5/12.Найдите sina

Answer 1

I hope this helps you



tga=sina/cosa= - 5/12


cosa= - 12sina/5


cos²a+sin²a=1


144sin²a/25+sin²a=1


sin²a=25/169


sina= 5/13 cosa= - 12/13 (π/2-π)


sina= - 5/13 cosa= 12/13 (3π/2-2π)