Ask Experts Questions for FREE Help !
Ask
    alli3mma's Avatar
    alli3mma Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 7, 2012, 02:13 PM
    how do you prove that (sin2x)/(1+cos2x)=tanx
    I need this to be worked out step by step asap
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
    Expert
    		  
    #2

    Nov 7, 2012, 02:56 PM
    Try using the identities for sin(2x) and cos(2x).

    sin(2x) = 2 sinxcosx
    cos(2x) = cos^2x - sin^2x = 1 - 2sin^2x = 2 cos^2x -1

    One of these identities for cos(2x) makes your proof come right out.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

(sin2x)^2/1-cos2x=2 (cosx)^2 [ 23 Answers ]

proof that left side = right side

Verify this identity: cos^2x=(1/2)cos2x [ 1 Answers ]

A friend asked me to try to help, and I can't get it.

Sin5x = sinx(cos^2 2x - sin^2 2x) 2 (cosx )(cos2x)(sin2x) [ 0 Answers ]

Prove

Prove tanx/(secx+1)=(2cosx-2 cos(^2)x)/(2sinx∙cosx) [ 5 Answers ]

I need to manipulate one side so that it becomes the same as the other side. I've tried to manipulate either side but I can't seem to figure it out. Step by step PLEASE!

Identities for sin2x and cos2x [ 9 Answers ]

How do I do a problem dealing with identities for sin2x and cos2x? Must be proven algebraically. Sin^2x=1-cos2x/2

View more questions Search