1) 1-sin^2d-cos^2d 2) (2+tg^2d) cos^2d Упростить

Question

1) 1-sin^2d-cos^2d
2) (2+tg^2d) cos^2d
Упростить

Answer 1

1) 1- (1) = 0
2) (2 + sin^2/cos^2)* cos^2 = 2cos^2 a+ sin^2 a = 1+ cos^2 a.