# Math Help - trigonometry C3

1. ## trigonometry C3

Solve, for 0 θ < 360, the equation

2 tan^2 θ + sec θ = 1

giving your answer to 1 decimal place

2. Hello,
Originally Posted by sharp357
Solve, for 0 θ < 360, the equation

2 tan^2 θ + sec θ = 1

giving your answer to 1 decimal place

Remember :

$1+\tan^2(x)=\sec^2(x)$

so your equation is :

$2\sec^2 \theta+\sec \theta-3=0$

this is a quadratic

3. ok thaks, i can do this now