Question

Calculati:a) sin 30 grade ori tg 45 grade + cos 30 grade ori ctg 60 grade.
b) sin 60 grade ori cos 60 grade + sin 30 grade ori cos 30 grade - sin 45 grade ori cos 45 grade.
Ajutor va rog frumos))

Answer 1

Răspuns:

Explicație pas cu pas:

a) sin 30 grade ori tg 45 grade + cos 30 grade ori ctg 60 grade=

=1/2.×1+1/2×1=1/2+1/2=1

b) sin 60 grade ori cos 60 grade + sin 30 grade ori cos 30 grade - sin 45 grade ori cos 45 grade.=√3/2×1/2+1/2×√3/2-√2/2√2/2=2×√3/2-1/2=

=√3-1