Whynot say then solve
Im struggling to get my head around radians, and with this question im lost.
And if you could explain what you're oing as wel so i can follow on thatd be brilliant.
Find all exact solutions in radians of
2cos^2 a + sqrt2 cos a = 0, when 0 _< a _< 2pi
_< is greater or equal to.
Fanks!
Can you solve a general quadratic? I.e. do you know that if $\displaystyle \begin{align*} ax^2 + bx + c = 0 \end{align*}$ then $\displaystyle \begin{align*} x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \end{align*}$?
If so, can you solve $\displaystyle \begin{align*} 2x^2 + \sqrt{2}x = 0 \end{align*}$?