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27 November, 12:38

Find the value of sec 38 ° to 4 decimal places.

a. 1.6243

b. 0.7880

c. 0.6157

d. 1.2690

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Answers (1)
  1. 27 November, 13:37
    0
    Secd (38)

    = 1/cosd (38)

    = 1/sqrt[1-sind^2 (38) ] because cos^2 (x) + sin^2 (x) = 1

    cos (30) = sqrt (3) / 2 = 0.8660

    cos (45) = 0.707

    so cos (38) can be assumed to some where around 0.8

    = 1/0.8

    = 1.25

    Therefore D is correct answer
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