Mark M. answered 07/11/18
Tutor
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Retired Math prof with teaching and tutoring experience in trig.
sin(π/2 - θ) = sin(π/2 + (-θ))
= sin(π/2)cos(-θ) + cos(π/2)sin(-θ) = (1)cos(-θ) + (0)sin(-θ)
= cos(-θ) = 0.95