Question

Determine o valor de (tg 0° - sen 45° )² - (sen 30° + cos 60° )²

Answer 1

Resposta:

(tg 0° - sen 45° )² - (sen 30° + cos 60° )²

(0- √2/2)² - (1/2+ 1/2 )²

(- √2/2)² - (1 )²

=2/4 -1

=1/2-1

= -1/2