👤

sin²130+cos³50. help!! am lasat pe ultimul timp si am muult de facut...

Răspuns :

      
[tex]sin^2 130^o+cos^2 50^o = ~~~~~(Aducem ~pe~sinus~la~cadranul~I)\\ \\ =sin^2(180^o - 50^o)+cos^2 50^o= \\ \\ =sin^2 50^o+cos^2 50^o= 1~~~(Formula~fundamentala~in~trigonometrie)[/tex]