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January 25, 2015

January 25, 2015

Posted by **Carol** on Monday, January 3, 2011 at 6:45pm.

Could someone show me how,

(- sin (x/2) /( 2 sin (x/2) + cos (x/2))

is an alternate representation for,

1 / ( 4 tan (x/2) + 2 )

TIA

Carol

This doesn't require the solving of any equations. For example, ( same concept for what I need done above )

1st representation: (sec x )/(tan^2 x)

Since, sec x = 1/cos x and

tan x = sin x /cos x

the 1st representation can be converted to,

(cos x )/(sin^2 x )

Hope this clears things up?

TIA,

Carol

- trig -
**Reiny**, Monday, January 3, 2011 at 7:51pmBoth bobpursley and I showed you in 2 different replies that

(- sin (x/2) /( 2 sin (x/2) + cos (x/2)) cannot be an alternate representation of 1 / ( 4 tan (x/2) + 2 )

http://www.jiskha.com/display.cgi?id=1294088333

and

http://www.jiskha.com/display.cgi?id=1294093837

trust us, and check your problem and typing again.

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