having trouble finding all the angles.
I can get:
sec 2x = 2
= cos 2x = 1/2
2x= pi/3
x= pi/6
positive cosine is quadrant (Q) 1 and 4
Q1= pi/6
Q4 = (2pi - pi/6)-2pi = -Pi/6 (adjusted to parameters)
theres two more angles however, 5Pi/6 and -5pi/6 which Im not sure how to get. The 2x I'm guessing means that its frequency is happening twice as much hence 4 angles. Just not sure how to get them. Ive tried messing around with not much luck.
any help?
cheers
I can get:
sec 2x = 2
= cos 2x = 1/2
2x= pi/3
x= pi/6
positive cosine is quadrant (Q) 1 and 4
Q1= pi/6
Q4 = (2pi - pi/6)-2pi = -Pi/6 (adjusted to parameters)
theres two more angles however, 5Pi/6 and -5pi/6 which Im not sure how to get. The 2x I'm guessing means that its frequency is happening twice as much hence 4 angles. Just not sure how to get them. Ive tried messing around with not much luck.
any help?
cheers