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WAEC - Mathematics (1998 - No. 34)
In \(sin(X+30)^o=cos40^o\),find X
10
o
20
o
50
o
60
o
90
o
Maelezo
\(sin(X+30)^o=cos40^o\\
X+30+40=90^o\)complementary angles
\(X=20^o\)
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