solve the equation for exact solutions in the interval 0360
solve the equation for exact solutions in the interval (0-360). use an algebraic method
(cot(theta) - square root of 3) (square root of 2)sin(theta)+1) = 0
solution set=?
Solution
(cot theta - sqrt 3 )( sqrt 2 sin theta + 1) = 0
cot theta - sqrt 3 = 0 or sqrt 2 sin theta + 1 = 0
adding sqrt 3 on both sides
cot theta = sqrt 3
theta = cot^-1 sqrt 3
theta = pi/6 , 7pi/6
sqrt 2 sin theta + 1 = 0
subtracting 1 from both sides
sqrt 2 sin theta = -1
sin theta = -1/ sqrt2
theta = 5pi/4 , 7pi/4
solutions are
7pi/6 , pi/6 , 5pi/4 , 7pi/4
