Question

what is the smallest value of
(look below)
for the interval 0 is less than or equal to theta is less than 2pie

Answer 1

\[2\sin^2(\theta)-\cos \theta-1=0\]

Answer 2

@Hero can u please help me

Answer 3

change the sin to cos using the simplest trig identity you can think of, and you have a quadratic in cos.