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Help with sin^2x + cosx + 1 = 0?
how do I do this?
1 Answer
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- Anonymous1 decade agoFavorite Answer
sin^2x=cos^2x=1
cosx=square root of(1-sin^2x)
1-cos^2x+cosx+1=0
2-cos^2+cosx=0
let cosx=a
-a^2+a+2=0
than use quadratic formular
a=2 or -4
cosx cannot be nagative
so a=2
cosx=2
solve it by calculator~
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