Saturday

December 20, 2014

December 20, 2014

Posted by **Yadira** on Monday, May 14, 2012 at 7:15pm.

- Pre-Calc/Math -
**MathMate**, Tuesday, May 15, 2012 at 5:18amI think the parentheses are in the wrong place. It should probably read:

(1-cos2x)/tan x = sin2x

Again, split everything into sin and cos, and don't forget the identities:

cos(2x)=cos²(x)-sin²(x)

sin(2x)=2sin(x)cos(x)

(1-cos(2x))/tan(x)

=(1-(cos²(x)-sin²(x))*(cos(x)/sin(x))

=(1-(1-2sin²(x))*cos(x)/sin(x)

=2sin²(x)*cos(x)/sin(x)

=2sin(x)cos(x)

=sin(2x)

**Answer this Question**

**Related Questions**

gr 12. advanced functions - Trig identity Prove: cos2x tan(pie/4 - x...

Pre-Calc (Prove the identity) - Prove the identity. (show your work please) tan(...

Math - Required to Prove the following trig identity: (cos2x)^2 + (sin2x)^2 = 1

Pre-Calc (Prove the identity) - Prove the identity. (show steps please!) Thank ...

calc - Where do I start to prove this identity: sinx/cosx= 1-cos2x/sin2x please ...

Pre-Calc Help!!! - Prove the identity. (show your work please) tan(x − &#...

Pre-Calc !!! - Prove the identity. 2tanx/1+tan^2x=sin^2x

Pre Calculus - Establish the following identity Sin2x/1+cos2x=tanx

maths - prove that 1+sin2x-cos2x / sin2x+cos2x = tanx

pre-calc - tanx= -12/5 x in Q 2. find sin2x= cos2x= tan2x=