Question on: WAEC Mathematics - 1998
In \(sin(X+30)^o=cos40^o\),find X
A
10o
B
20o
C
50o
D
60o
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Correct Option: B
\(sin(X+30)^o=cos40^o\
X+30+40=90^o\)complementary angles
\(X=20^o\)
X+30+40=90^o\)complementary angles
\(X=20^o\)
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