Question

1 + tg²B = ............​

Answer 1

Ответ:

1+tg²B=$\frac{1}{cos^2 B}$

Answer 2

Tg x = sin x / cos x

1 + tg² b = 1  + sin² b / cos² b = (cos² b + sin² b) / cos² b = 1 / cos² b