# Math Help - i need help with simplifying trig fractions

1. ## i need help with simplifying trig fractions

how do you simplify (1-tanθ/2)/(1+tanθ/2)
need help exam tomorrow

2. Originally Posted by pogiphilip
how do you simplify (1-tanθ/2)/(1+tanθ/2)
need help exam tomorrow
1. Substitute $\tan \frac{\theta}{2} = \frac{\sin \frac{\theta}{2}}{\cos \frac{\theta}{2}}$.

2. Simplify by multiplying numerator and denominator by $\cos \frac{\theta}{2}$.

3. Multiply the numerator and denominator of the above resulting expression by $\cos \frac{\theta}{2} - \sin \frac{\theta}{2}$.

4. Simplify by applying the Pythagorean Identity and a Double Angle formula.

3. sorry for your help but it wasnt the actual question i was ment to answer from my text book but thank you for your help mr fantastic