Mark M. answered 04/16/18
Tutor
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(954)
Retired Math prof with teaching and tutoring experience in trig.
sinθ = cos(90° - θ)
So, sin72° = cos18°
Sarina N.
asked 04/16/18Mark M. answered 04/16/18
Retired Math prof with teaching and tutoring experience in trig.
Arturo O. answered 04/16/18
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