# MATH

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

1. 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

posted by Bosnian
2. Magic math.

posted by bobpursley

## Similar Questions

1. ### Trigonometry

I need to prove that the following is true. Thanks. csc^2(A/2)=2secA/secA-1 Right Side=(2/cosA)/(1/cosA - 1) = (2/cosA)/[(1-cosA)/cosA] =2/cosA x (cosA)/(1-cosA) =2/(1-cosA) now recall cos 2X = cos^2 X - sin^2 X and we could say
2. ### further mathematics

Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))
3. ### Maths

Prove that [sinA/(1-cosA)-(1-cosA)/sinA]*[cosA/(1+sinA)+(1+sinA)/cosA]=4cosecA I the second part as 2 secA
4. ### Maths

Hi, can someone give me the answer to this question: secA-tanA=1/4. Find cosA I got: CosA=4(1-sinA) Is my answer good? Now multply each side by (1+sinA) CosA(1+sinA)=4 cos^2 A CosA=1/4 (1+sinA) 16(1-sinA)=1+sinA 15=17SinA So you
5. ### Math

If 1-cosA=5/13, prove that 25sinA(sinA - cosA)
6. ### math

Sina+cosa=root over cosA
7. ### math

Sina+cosa=root over cosA
8. ### Spanish

Choose the grammatically correct sentence. A. Está cosa es un lápiz amarillo.<<X B. Esta cosa es un lápiz amarillo. C. Esta cosa es una lápiz amarilla. D. Esta cosa es unas lápiz amarilla. <<X Not sure between B
9. ### Math

CosA/1+sinA=1-sinA/cosA I have to prove the identity each side has to b the same how would i do that? I have a unit test on monday so im doing practice questions
10. ### Maths, Divine International Public School

If 15Cot=8, find (1+SinA)(1-SinA)/(1+CosA)(1-CosA)

More Similar Questions