In \(sin(X+30)^o=cos40^o\),find X

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Mathematics WAEC 1998

In \(sin(X+30)^o=cos40^o\),find X

  • 10o
  • 20o checkmark
  • 50o
  • 60o
  • 90o

The correct answer is: B

Explanation

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