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LHS: (1 - cos x)/sin x = (1 - cos x)(1 + cos x)/[sin x(1 + cos x)] = (1 - cos^2 x)/[sin x(1 + cos x)] = sin^2 x/[sin x(1 + cos x) = sin x/(1 + cos x) I think you copied it wrong.

1 Answers · Science & Mathematics · 26/08/2011

2. ### Prove the trig identity: cot(theta)sec(theta)sin(theta) = 1?

LHS = cot(θ)sec(θ)sin(θ) = cos(θ)/sin(θ) * 1/cos(θ) * sin(θ) = 1 = RHS I hope this helps!

3 Answers · Science & Mathematics · 19/05/2011

3. ### Prove this trig identtiy:?

LHS = sec²(x) - sec²(y) = (1+tan²(x)) - (1+tan²(y)) = 1 + tan²(x) - 1 - tan²(y) = tan²(x) - tan²(y) = RHS

3 Answers · Science & Mathematics · 22/07/2009

4. ### Math trigonometric identities proving?

LHS = (1+cosx)/sinx = [ 1 + (2cos^2(x/2) - 1)]/2sin(x/2)cos(x/2) = 2cos^2(x/2)/2sin(x/2)cos(x/2) = cos(x/2)/cos(x/2) * cos(x/2)/sin(x/2) = 1 * cos(x/2)/sin(x/2) = cot(x/2) = RHS

2 Answers · Science & Mathematics · 30/11/2016

5. ### Prove: Tan^2x - sin^2x = sin^2x tan^2x?

LHS= tan^2x - sin^2x =(sin^2x / cos^2x) - sin^2x = (sin^2x - sin^2x cos^2x) / cos^2x = sin^2x (1-cos^2x) / cos^2x since sin^2x = 1 - cos^2x = sin^2x (sin^2x) / cos^2x = sin^2x tan^2x = RHS

2 Answers · Science & Mathematics · 14/11/2013

6. ### Trigonometric Identities #3!?

LHS = 1/sec x + sin x/cot x = cos x + sin x tan x = cos x + sin x * sin x / cos x = cos x/cos x * cos x + sin x * sin x / cos x = (cos^2 x + sin^2 x ) / cos x = 1 / cos x = RHS

3 Answers · Science & Mathematics · 29/01/2011

7. ### Trig identity. cos2x/(1+sin2x)= tan(pi/4-x)?

LHS = cos2x / (1 + sin2x) = (cos^2 x - sin^2 x) / (cos^2 x + sin^2 x + 2sin x cos x) = [(cos...

2 Answers · Science & Mathematics · 18/12/2010

8. ### cot(x-y)= cotxcoty+1/coty-cotx?

LHS = cot(x-y) = 1/tan(x-y) = 1/((tan(x) - tan(y))/(1 + tan(x)tan(y))) = (1 + tan(x)tan(y)) / (tan(x) - tan(y)) ------- now divide the numerator and denominator by tan(x)tan(y) = (cot(x)cot(y) + 1) / (cot(y) - cot(x)) = RHS

7 Answers · Science & Mathematics · 27/10/2008

LHS = 4-1/x, which goes to 4. RHS = 4+3/x, which also goes to 4 Limit of f(x) is trapped between two functions going to 4, so it's limit is 4 also.

1 Answers · Science & Mathematics · 27/06/2008

10. ### sin....cosine.....very short!!! please open!!?

LHS: sin x + sin x cot^2 x = sin x + sin x • cos^2 x/sin^2 x = sin x + cos^2 x/sin x = (sin^2 x + cos^2 x)/sin x = 1/sin x = csc x

2 Answers · Education & Reference · 19/08/2011