Arturo O. answered • 04/20/18
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cos(90° - θ) = sinθ
sin(90° - θ) = cosθ
These are well-known trigonometric identities.
Elisa F.
asked • 04/20/18Which expression is equivalent to cos (90°-theta)?
A. sin (theta)
B. -sin(theta)
C. cos (theta)
D. -cos (theta)
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