- #1
Chop235
- 1
- 0
I am stuck on this problem:
It tells me to use the Half-Angle Formulas to find the exact value of the trig function.
sec((15*pi)/8)
I know I should convert that into the cos function and when I do I get:
cos(8/(15*pi))
But now I need to find cos(alpha/2) to be able to use the Half-Angle formula. I think what I can do is multiply it by 2 and then that would be my alpha, then I could just plug it in right? So then I would have:
cos((16/(15*pi))/2)
I am not sure if this is right so far or if I am even on the right track.
It tells me to use the Half-Angle Formulas to find the exact value of the trig function.
sec((15*pi)/8)
I know I should convert that into the cos function and when I do I get:
cos(8/(15*pi))
But now I need to find cos(alpha/2) to be able to use the Half-Angle formula. I think what I can do is multiply it by 2 and then that would be my alpha, then I could just plug it in right? So then I would have:
cos((16/(15*pi))/2)
I am not sure if this is right so far or if I am even on the right track.