Răspuns :
Salut,
[tex]sin30^{\circ}\cdot cos60^{\circ}\cdot sin60^{\circ}\cdot cos30^{\circ}=\dfrac{1}2\cdot\dfrac{1}2+\dfrac{\sqrt3}2\cdot\dfrac{\sqrt3}2=\\\\=\dfrac{1}4+\dfrac{3}4=\dfrac{1+3}4=\dfrac{4}4=1.[/tex]
Green eyes.
Salut,
[tex]sin30^{\circ}\cdot cos60^{\circ}\cdot sin60^{\circ}\cdot cos30^{\circ}=\dfrac{1}2\cdot\dfrac{1}2+\dfrac{\sqrt3}2\cdot\dfrac{\sqrt3}2=\\\\=\dfrac{1}4+\dfrac{3}4=\dfrac{1+3}4=\dfrac{4}4=1.[/tex]
Green eyes.