Question

Determine o valor de A, de que modo que A=sen105+cos105. ​

Answer 1

Resposta:

Explicação passo-a-passo:

A=sen105+cos105=sen(60+45)+cos(60+45)

=sen60.cos45+sen45.cos60+cos60.cos45-sen60.sen45

=√3/2.√2/2+√2/2.1/2+1/2.√2/2-√3/2.√2/2

=√6/4+√2/4+√2/4-√6/4

=2√2/4

√2/2