lizzymiller155
lizzymiller155 lizzymiller155
  • 20-03-2018
  • Mathematics
contestada

Need help!! Answers are
A. 0, 5pi/4
B. 7pi/6, 11pi/6
C. 3pi/4, 7pi/4
D. Pi/4, 5pi/4

Need help Answers are A 0 5pi4 B 7pi6 11pi6 C 3pi4 7pi4 D Pi4 5pi4 class=

Respuesta :

alkhalidisara
alkhalidisara alkhalidisara
  • 20-03-2018

1−cos2θ/cos2θ=−3/2⋅1/cosθ

2(1−cos2θ)= −3cos θ and cosθ≠0

2−2cos2θ+3cosθ=0 and cosθ≠0

2cos2θ−3cosθ−2=0 and cosθ≠0

cosθ=3±√9+16/4 and cosθ≠0

cosθ=3±5/4 and cosθ≠0

cosθ=−1/2;cosθ=2andcosθ≠0

so the answer is 

θ=2pie /3and θ=4π/ 3

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