Parker R.
asked • 04/09/17trigonometry
cos(2theta)=2-2sin^2theta
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2 Answers By Expert Tutors
Kenneth S. answered • 04/09/17
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4.8
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Replace the left side expression, using the double angle formula for cos 2θ = 1 - 2sin2θ
and then you have
1 - 2sin2θ = 2-2sin2θ which I believe you will realize will only be true if 1 = 2.
REJECTED!
Mark M. answered • 04/09/17
Tutor
5.0
(278)
Mathematics Teacher - NCLB Highly Qualified
cos 2θ = 2 - 2sin2 θ
cos2θ - sin2θ = 2 - 2sin2θ double angle formula
1 - sin2θ - sin2θ = 2 - 2sin2θ
1 - 2sin2θ = 2 - 2sin2θ
1 = 2
∅
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Michael J.
04/09/17