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25 March, 18:49

Which of the following equals cos 80°

A) sin 20°

B) sin 100°

c) sin 10°

D) sin 80°

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Answers (1)
  1. 25 March, 21:44
    0
    C

    Step-by-step explanation:

    Using the Cofunction identity

    sin (90 - x) ° = cos x°, hence

    cos80° = sin (90 - 80) ° = sin10° → C
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