If cos x 40 o 0 0872 what is the value of x - WAEC Mathematics 2012 Question
If cos(x + 40)o = 0.0872, what is the value of x?
A
85o
B
75o
C
65o
D
45o
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Correct Option: D
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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