Friday

November 21, 2014

November 21, 2014

Posted by **Anonymous** on Saturday, February 16, 2013 at 3:48am.

1+sin2x-cos2x / sin2x+cos2x = tanx

- maths -
**Reiny**, Saturday, February 16, 2013 at 7:36amnot true, so it can't be proven the way you typed it

probably**needs brackets**

counterexample:

let x = 30°

LS = 1 + sin60° - cos60°/sin60° + cos60°

= 1 + √3/2 - (1/2) / (√3/2) + 1/2

= 3/2 + √3/2 - 1/√3

RS = tan 30 = 1/√3 ≠ LS

**Answer this Question**

**Related Questions**

Math please help quick - Which of the following are identities? Check all that ...

trigonometry - Been trying this forever so it says: Simplify 1+sin2x+cos2x/1+...

trig - sinx = 4/5 and x terminates in Quadrant II Find sin2x and cos2x How to ...

trig - tanx = 5/12 and sinx<0 Find sin2x and cos2x How to get the answers of ...

trig - write sin4xcos2 as the sum or difference of two functions. answers: 1/2(...

trig - write sin4xcos2 as the sum or difference of two functions. answers: 1/2(...

trig - write sin4xcos2 as the sum or difference of two functions. answers: 1/2(...

math - Prove the identity: 1-cos2x/sin2x = 1+tanx/1+cotx I simplified the RS to ...

trig - cotx = -2 and 0 less than or equal to x less than or equal to pi Find ...

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