Post a New Question

Maths

posted by on .

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 have sinA, now find Cos A from your equation you originally solved.

  • Maths - ,

    Cos A= 4(1-(15/17))

    cos A= 4(12/17)

    Cos A= 48/17

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question