If cos x = -0.7133, find the values of x between 0\(^o\) and 360\(^o\)
FURTHER MATHEMATICS
WAEC 2020
If cos x = -0.7133, find the values of x between 0\(^o\) and 360\(^o\)
- A. 44.5\(^o\) , 224.5\(^o\)
- B. 123.5\(^o\) , 190.5\(^o\)
- C. 135.5\(^o\) , 213.5\(^o\)
- D. 135.5\(^o\) , 224.5\(^o\)
Correct Answer: D. 135.5\(^o\) , 224.5\(^o\)
Explanation
cos x = -0.7133
x = cos \(^{-1}\)(0.7133)
= 44.496\(^o\)
x = 180 - 44.495\(^o\)
x = 135.5\(^o\)
and x = 180\(^o\) + 44.495\(^o\)
= 224.5\(^o\)
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