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22 December, 22:11

Find ϴ in the equation sin (ϴ + 15) = cos (2ϴ)

a. 50

b. 75

c. 25

d. 40

+4
Answers (1)
  1. 23 December, 00:18
    0
    The answer is c. 25

    sin (ϴ + 15) = cos (2ϴ)

    sin (ϴ + 15) = sin (25 + 15) = sin (40) = 0.64

    cos (2ϴ) = cos (2x25) = cos (50) = 0.64

    so ϴ=25
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