ఒకవేళ A యొక్క కోణం = 30° మరియు  B యొక్క కోణం = 90° అయితే, sin (A + B) = ?

1
\(\frac{2}{{\sqrt 3 }}\)
2
\(\frac{1}{2}\)
3
\(\frac{1}{{\sqrt 2 }}\)
4
\(\frac{{\sqrt 3 }}{2}\)

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