If theta =( -7pi )/( 3) , then sec(theta) equals...?
3 answers
sec(-7pi/3) = sec(7pi/3) = sec(7pi/3 - 2pi) = sec(pi/3) = 2
Can you visualize angles better in degrees?
most students can, so
7π/3 = 7(6-°) = 210°
210° is in quadr III
the reference angle is 30° ( we are 30° from the x-axis)
I know cos 30° = √3/2
in III, the cosine, and thus the secant, is negative
sec (7π/3)
= sec 210°
= 1/cos 210°
= 1/(-√3/2)
= -2/√3
most students can, so
7π/3 = 7(6-°) = 210°
210° is in quadr III
the reference angle is 30° ( we are 30° from the x-axis)
I know cos 30° = √3/2
in III, the cosine, and thus the secant, is negative
sec (7π/3)
= sec 210°
= 1/cos 210°
= 1/(-√3/2)
= -2/√3
scrap my solution
had another "senior moment"
had another "senior moment"
2 answers