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1. ### How does ((-2)^x)/(2^x)=(-1)^x?

LHS = (-2)^x / 2^x = (-1 * 2 )^x / 2^x = (-1)^x * 2^x / 2^x = (-1)^x

2 Answers · Science & Mathematics · 03/04/2012

2. ### Proving Identities Re-post?

LHS: Top: tan²θ + 1 = sin²θ/cos²θ + 1 = sin²...

5 Answers · Science & Mathematics · 16/05/2007

LHS: The numerator is the difference of perfect quares, hence, ...

4 Answers · Science & Mathematics · 15/04/2007

4. ### simple yet not possible trig ?

LHS = tan x + cot x ...... = ( s/c ) + ( c/s ) ...... = ( s² + c² ) / ( sc...

3 Answers · Science & Mathematics · 25/01/2010

5. ### 2 cot x / 1+ cot^2 x = sin 2 x?

LHS = 2 cot x / (1+ cot^2 x) = 2 cot x/ (cosec ^2 x) = 2 cos x/ sin x/(1/ sin ^2 x) = 2 cos x sin x = sin 2x

2 Answers · Science & Mathematics · 30/09/2012

LHS = cos²A.sec²A + cos²A.secA + cos²A 1...

1 Answers · Science & Mathematics · 11/01/2014

7. ### Prove this trig identity: cos x tan^3x=sin x tan^2x?

LHS = cos x tan^3x=sin x tan^2x = cosx[sin^3x/cos^3x] = [cosx/cos^3x]*[sinx*sin^2x] = [ 1/cos^2x]*[sinx*sin^2x] = sinx[sin^2x/cos^2x] = sinx tan^2x = RHS

2 Answers · Science & Mathematics · 05/05/2014

8. ### help with trig identities?

... LHS = ( csc ) ( 1 - cos ) = ( 1 / sin ) ( 1 - cos ) = [ ( 1 - cos ) / ( sin ) ] • [ ( 1 + cos...

2 Answers · Science & Mathematics · 21/12/2011

9. ### prove d/dt[a-(v*r)]=a*(v*r)?

LHS d/dt[a-(v*r)]=da/dt -r*dv/dt -v*dr/dt d/dt[a-(v*r)]=da/dt -r*a -v^2 RHS a*(v*r) I can't prove it.

2 Answers · Science & Mathematics · 25/09/2007

10. ### -2sinx*cosx - 4sin^2x = asin2x * cos2x + c?

LHS=-sin2x - 2(1-cos2x) = -sin2x + 2cos2x - 2 = asin2x + bcos2x + c , a=-1 , b=2 , c=-2

2 Answers · Science & Mathematics · 27/05/2013