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13 January, 12:07

Which of the following statements is true?

a.

sin 18° = cos 72°

b.

sin 55° = cos 55°

c.

sin 72° = cos 18°

d.

Both a and c.

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Answers (1)
  1. 13 January, 14:14
    0
    The answer is A.

    sin (18) = cos (72)

    cos (90 - 18) = cos (72)

    The answer isn't B.

    sin (55) = cos (55)

    cos (90 - 55) = cos (55)

    cos (35) ≠ cos (55)

    The answer is C.

    sin (72) = cos (18)

    cos (90 - 72) = cos (18)

    cos (18) = cos (18)

    The answer is D.
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