Respuesta :

I hope this helps you



cos^2 (x)+sin^2(x)=1


cos^2 (x)=1-sin^2 (x)


6.sin^2 (x)+2 (1-sin^2 (x))=5


6sin^2 (x)+2-4sin^2 (x)=5


2sin^2 (x)=3


sin^2 (x)=3/2


cos^2 (x)+3/2=1


cos^2 (x)=1-3/2


cos^2 (x)= -1/3

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