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3 April, 05:52

Which trig expression is equal to sin (72° - a) ?

A) cos 18°

B) sin 18°

C) cos (90° - (72° - a))

D) sin (90° - (72° - a))

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Answers (2)
  1. 3 April, 05:59
    0
    Its C. a famous relation sinA=cos (90-A)
  2. 3 April, 06:02
    0
    C c c c c c c c c c c
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