# solving trig equations

• March 13th 2008, 02:37 AM
Oranges&Lemons
solving trig equations
solve, for 0< a < 360, the equation

2tan squared a + sec a = 1

any help would be much appreciated, thanks :)
• March 13th 2008, 02:42 AM
mr fantastic
Quote:

Originally Posted by Oranges&Lemons
solve, for 0< a < 360, the equation

2tan squared a + sec a = 1

any help would be much appreciated, thanks :)

Substitute $\tan^2 a = \sec^2 a - 1$ and re-arrange to get a quadratic in sec a ......