# math

posted by .

(secA+tanA)(1-sinA)

• math -

just expand and see what happens
I'll elide the x's just for ease of typing

sec - sec*sin + tan - tan*sin
sec - tan + tan - tan*sin
sec - sin^2 * sec
sec(1-sin^2)
sec*cos^2
cos

## Similar Questions

1. ### Trig

Please help with this one. I've worked it out in so many ways and can't tell what's correct. sinA sinA ----- - ------ 1+sinA 1-sinA Which answer is correct for the problem above?
2. ### 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?
3. ### algebra

i have a problem in dis sum from complex numbers prove that (1+sinA+icosA)/(1-sinA-icosA)=i(secA+tanA)
4. ### maths(trigonometry)

prove that sinA-cosA+1/sinA+cosA-1=1/secA-tanA
5. ### trig

express the trig. ratios sinA,secA n tanA in terms of cotA.
6. ### Math

Prove the identity: tanA/secA+1 = secA-1/tanA Can u please explainit to me step by step?
7. ### Trig

prove that tanA divided by the sinA equals the secA
8. ### math

if tanA=root2-1, prove that (secA.sinA tan squareA-cosecA) =(12-¡Ì5)/2
9. ### Trigonometric Identities

Verify/prove the following: (sinA+tanA)/(1+secA) = sinA ______________________________ tanu = 1+sinu-cos^2u/cosu(1+sinu) __________________________________ cotu = (2+cscu/secu)-2cosu ______________________________ tanAsinA/tanA+sinA …
10. ### trigonometry

if secA-tanA =10 than sinA =?,cosA =?,secA =?

More Similar Questions