If cos(x + 40)° = 0.0872, what is the value of x?
MATHEMATICS
WAEC 2012
If cos(x + 40)° = 0.0872, what is the value of x?
- A. 85°
- B. 75°
- C. 65°
- D. 45°
Correct Answer: D. 45°
Explanation
cos(x + 40)o = 0.0872
x + 40 = cos-10.0872
x + 40o = 84.99o
x = 84.99o - 40o
x = 44.99
x = 45o
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