
Mark M. answered 04/29/20
Tutor
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(278)
Mathematics Teacher - NCLB Highly Qualified
4 cos2 x - 3 = 0
cos2 x = 3/4
cos x = ±√3 / 2
x = 5π / 6
Lean M.
asked 04/29/20Find all the solutions for 4cos^2 x - 3 =0 on the interval (90degrees,180 degrees). Not in radian form.
please show work and thank you
Mark M. answered 04/29/20
Mathematics Teacher - NCLB Highly Qualified
4 cos2 x - 3 = 0
cos2 x = 3/4
cos x = ±√3 / 2
x = 5π / 6
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