Jillian A.
asked 04/14/20
Verify the given identity: (sinθ+cosθ)^2+(sinθ-cosθ)^2=2.
Mark M.
answered 04/14/20
Mathematics Teacher - NCLB Highly Qualified
sin2 θ + 2 sin θ cos θ + cos2 θ + sin2 θ - 2 sin θ cos θ + cos2 θ
2 sin2 θ + 2 cos2 θ
2 (sin2 θ + cos2 θ)
2
QED
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