1.sec^x-2tanx=0
2.tan(x/2)=sinx
my teacher game me the answers: for 1 its 45,225 and for 2 its 0, 90, 270.
can you please explain it to me using some simple steps?
thanks
Your teacher forgot to mention the other infinitely many solutions.
Your solutions should be of the form
$\displaystyle x=\frac{\pi}{6}+\pi k, \ k\in\mathbb{Z}$
That isn't a solution to your questions but merely an example to how the solutions should be represented.