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WAEC - Mathematics (2012 - No. 17)

If cos(x + 40)o = 0.0872, what is the value of x?
85o
75o
65o
45o

解释

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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