Question on: WAEC Mathematics - 2008
If cos (x + 25)o = sin 45o, find the value of x
A
20
B
30
C
45
D
60
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Correct Option: A
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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