If cos (x + 25)° = sin 45°, find the value of x
MATHEMATICS
WAEC 2008
If cos (x + 25)° = sin 45°, find the value of x
- A. 20
- B. 30
- C. 45
- D. 60
Correct Answer: A. 20
Explanation
cos(x + 25o) = sin 45o
using cos \(\theta\) = sin(90 - \(\theta\))
cos(x + 25o) = cos(90 - 45)
cos(x + 25o) = cos 45
x + 25 = 45
x = 45 - 25
x = 20o
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