# MATH

posted by Anonymous

does anybody know how 1.04(cosA)^2 + 0.2(cosA) -0.75 = 0 become (cosA)^2 + 0.192(cosA) - 0.721 = 0

1. Bosnian

Are you kidding?

1.04 ( cos A )² + 0.2 ( cos A ) - 0.75 = 0

Divide both sides by 1.04

1.04 ( cos A )² / 1.04 + 0.2 ( cos A ) / 1.04 - 0.75 / 1.04 = 0 / 1.04

( 1.04 / 1.04 ) ∙ ( cos A )² + ( 0.2 / 1.04 ) ∙ ( cos A ) - 0.75 / 1.04 = 0

1 ∙ ( cos A )² + ( 0.2 / 1.04 ) ∙ ( cos A ) - 0.75 / 1.04 = 0

( cos A )² + 0.19231 ( cos A ) - 0.72115 = 0

approx.

( cos A )² + 0.192 ( cos A ) - 0.721 = 0

2. bobpursley

Magic math.

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