sin^2 30+ cos^2 60- tg^2 45
VA ROOG


Răspuns :

Sin² 30+ cos² 60- tg² 45
sin30=1/2
cos60=sin30=1/2
tg45=sin45/cos/45=1

                 ↓
(1/2)²+(1/2)² - 1= 1/2 - 1= -1/2