Friday
March 27, 2015

Homework Help: Trigo!

Posted by help! on Saturday, September 19, 2009 at 2:21am.

Ok, i did this maths trigo question, that says sinx-cos=2/3. I squared it on both sides to get sin2x=5/9 and did the sum. In the end i got two solutions, 16.9 and 73.1. However, when i substituted the answers back into the equation, only one of the 2 answers was correct! The other one didn't work out! Why is this so? I'm pretty sure both answers are correct, so what's going on? Please help!

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Trig....... - I need to prove that the following is true. Thanks (2tanx /1-tan^x...
maths - trigonometry - I've asked about this same question before, and someone ...
maths trigo - prove that sin(n+1)A-sin(n-1)A/cos(n+1)A+2cos(nA)+cos(n-1)A=tanA/2
Trig--check answer - Solve the equation of the interval (0, 2pi) cosx=sinx I ...
calc - Where do I start to prove this identity: sinx/cosx= 1-cos2x/sin2x please ...
Math - Find all solutions to the equation sqrt(2-3x)= 9. Express your answer as...
Trig Help - Prove the following: [1+sinx]/[1+cscx]=tanx/secx =[1+sinx]/[1+1/sinx...
maths - by equating the coefficients of sin x and cos x , or otherwise, find ...
Trigo - Given that a^2+b^2=2 and that (a/b)= tan(45degee+x), find a and b in ...
maths - hey, i would really appreciate some help solving for x when: sin2x=cosx ...

Members