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28 December, 11:51

Which of these is equal to sin 21°?

A) cos 21°

B) cos 69°

C) sin 69°

D) tan 69°

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Answers (1)
  1. 28 December, 13:08
    0
    Answer: Choice B) cos (69)

    Work Shown:

    cos (90-x) = sin (x)

    cos (90-21) = sin (21)

    cos (69) = sin (21)
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