Найдите cos^2x .если sin^2+10cos^2x=13
Sin^2x+10cos^2x=13
1-cos^2x+10cos^2x=13
1+9cos^2x=13
9cos^2x= 12
cos^2x = 12/9
cos^2x= 4/3
Оцени ответ
Sin^2x+10cos^2x=13
1-cos^2x+10cos^2x=13
1+9cos^2x=13
9cos^2x= 12
cos^2x = 12/9
cos^2x= 4/3