Question

Помогите срочно
Sin4a+sin2a*cos2a+cos2a-1=

Answer 1

Ответ:

sina^4 + sina^2×cosa^2 + cosa^2 - 1 =

= sina^4 +sina^2× cosa^2 - sina^2 =

= (sina^2 + cosa^2 - 1)×sina^2 =

= (1-1)×sina^2 = 0×sina^2 = 0