Ok, I know the Pythagorean identities but can't seem to solve these two question.
Evaluate. Give exact anwser.
sin² π/6 - tan² π/4 + cos² π/6
so all I can do on this question so far is use the identity sin x + cos x= 1 to get to
1 - tan² π/4
then I am lost.
The next question I have no idea what to do.
Solve the following equation
1 - 2 cos²Θ = -sinΘ, 0<Θ<2π