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1. ### how would i derive this co-function identity?

LHS(left hand-side)=csc(π-θ)=1/sin(π-θ) =1/cos(θ)=secθ=RHS sin(π-θ)=cos(θ) because sin(π-θ)=sin(π)sinθ-cos(π)cosθ =0×sinθ-(-cosθ)=0+cosθ=cosθ

2 Answers · Education & Reference · 07/04/2009

2. ### I need help on one trig problem?

LHS = 1 + cos (2x) - cos² x = 1 + 2 cos² x - 1 - cos² x ... [using the double angle formula cos (2u) = 2 cos² u - 1] = cos² x = RHS

1 Answers · Education & Reference · 12/12/2012

3. ### verify the identity: 2 csc 2u=sec u csc u?

LHS: 2 csc 2u = 2 / (sin 2u) = 2 / (2 sin u cos u) = 1 / (sin u cos u) = (1/sin u) * (1/cos u) = sec u csc u = RHS

1 Answers · Education & Reference · 26/01/2014

4. ### help! 2 questions on logarithmic functions?

LHS log (x-3) + log x can be written as log (x-3) multiplied with log x oh i just got confused.. need to help yew but.......... lol

4 Answers · Education & Reference · 14/04/2012

5. ### math algebra help for my homework.?

LHS = 5x - 5/8 RHS = 4x + 13/4 5x-5/8 = 4x + 13/4 5x - 4x = 13/4 + 5/8 x = 13/4 + 5/8 x = 26/8 + 5/8 x = 31/8

1 Answers · Education & Reference · 12/09/2013

6. ### Been stuck on these three PreCalc questions, help!?

1) LHS = tanx sinx + cosx = (sinx/cosx) sinx + cosx = (sin² x / cosx) + cos x = [(1...

1 Answers · Education & Reference · 27/04/2010

7. ### How do I solve 4^(x-1)=32^4?

LHS: 4^(x-1)=(2^2)^(x-1)=2^(2x-2) RHS: 32^4=(2^5)^4=2^20 Therefore 20=2x-2 x=11

1 Answers · Education & Reference · 24/01/2014

8. ### Why is the equation sinx-2sinxcosx equivalent to sinx(1-2cosx)?

LHS = sin x - 2 sin x cos x taking sin x common , we get sin x ( 1 - 2 cos x ) = RHS Good luck !

1 Answers · Education & Reference · 03/08/2012

9. ### (1+sinx)(1-sinx)=cos^2x?

By FOIL, it is 1 - sin^2 x which by the Pythagorean identity is cos^2 x

1 Answers · Education & Reference · 21/05/2013

10. ### verify: tan^2x(csc^2x-1)=1?

tan²x • (csc²x – 1) = 1    sin²x • [ (1 ⁄ sin²x)  –  1 ] ⁄ cos²x = 1        (1 – sin²x) ⁄ cos²x = 1  ...  use identity: 1 – sin²x = cos²x...

1 Answers · Education & Reference · 21/05/2013