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WAEC - Mathematics (1998 - No. 34)

In \(sin(X+30)^o=cos40^o\),find X
10o
20o
50o
60o
90o

Paskaidrojums

\(sin(X+30)^o=cos40^o\\
X+30+40=90^o\)complementary angles
\(X=20^o\)

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